#40

Monster

Monster Shock Plus Bluetooth Speaker Monster S21

Name: Shock Plus Bluetooth Speaker Monster S21
Brand: Monster
SKU: B0FGPXKBT4
Price: 3499 JPY
Availability: InStock
Rating: 3.6875 (1 reviews)

Rating

Model: Monster S21

$3,499(incl. tax)Amazon price as of 2025-08-08

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Product Overview

The Monster Shock Plus Bluetooth Speaker delivers 30W of powerful stereo sound with crystal-clear highs and deep bass. It features Bluetooth 5.4 for stable connectivity and TWS pairing for a 60W stereo experience. With up to 15 hours of playtime and an IPX6 waterproof rating, it's perfect for both indoor and outdoor use. Additional features include a built-in mic for hands-free calling, AUX/TF card support, and USB inputs for versatile connectivity.

Product Specifications

Speaker Type

OutdoorN/A

Bluetooth Version

5.4N/A

Battery Life

15hours

Water Resistance

Water ResistantN/A

Wireless Range

10.0584meters

Charging Time

2hours

Weight

911.716grams

Dimensions

75.946 x 256.032 x 102.083mm

Supported Codecs

BluetoothN/A

Built-in Microphone

YesN/A

Size & Weight

Weight

2.01 pounds

Hight

4.02"H

Width

10.08"W

Depth

2.99"D

Features

Waterproof Function

Feature Description

A function that protects the speaker from water splashes and rain. You can use it without worry at the beach, by the pool, or in the bathroom. Enjoy music anywhere without worrying about water damage.

About This Product

The IPX6 waterproof rating protects the speaker from splashes, rain, and spills, making it suitable for use near pools, beaches, and during outdoor activities. This ensures worry-free listening without concern for water damage, enhancing its durability and versatility.

Built-in Microphone Function

Feature Description

A function that allows hands-free calling when connected to a smartphone. You can answer calls directly through the speaker while doing housework or working. Convenient for hands-free communication.

About This Product

The built-in microphone enables hands-free calling, allowing users to answer calls directly through the speaker while multitasking. This feature is convenient for conference calls, driving, or when your hands are occupied, ensuring clear and seamless communication.

External Device Charging Function

Feature Description

A function that allows charging smartphones and other devices using the speaker's battery. Useful as a backup battery for your smartphone when you are outdoors. Prevents battery drain when away from power sources.

About This Product

This speaker does not support external device charging. Therefore, it cannot be used as a power bank to charge smartphones or other devices. Users needing this function should consider alternative models with power bank capabilities.

Stereo Pairing Function

Feature Description

A function that allows connecting two identical speakers for stereo playback. You can enjoy a wider soundstage and more powerful sound by separating the left and right channels. Enhances the immersive experience when watching movies or listening to music.

About This Product

TWS pairing allows connecting two identical speakers for a more immersive stereo experience. By pairing two speakers, you can create a wider soundstage and enjoy more powerful, 360° stereo sound, enhancing music and movie playback.

Preset Equalizer Function

Feature Description

A function that allows selecting sound modes optimized for different music genres. You can easily switch to the ideal sound settings for pop, rock, or classical music. Enjoy music with sound quality tailored to each genre.

About This Product

This speaker does not offer preset equalizer functions. Users cannot select sound modes optimized for different music genres. Sound customization options are limited, which may affect the listening experience for audiophiles.

Voice Assistant Activation Function

Feature Description

A function that allows activating voice assistants like Siri or Google Assistant. You can control music playback, check the weather, and perform other tasks hands-free. Provides smart control without touching your smartphone.

About This Product

This speaker does not support voice assistant activation. Users cannot control music playback, check the weather, or perform other tasks hands-free via voice commands. Operation requires manual control through buttons or connected devices.

SHOPSTAFF Rating Score

#40

Ranked #40 out of 99 products in Category

3.7

Overall Rating

The Monster Shock Plus offers good sound and features for its price range. Battery life is decent, and the IPX6 rating adds versatility. However, sound quality and build may not match higher-end models. Expect reasonable durability for typical use.

Sound Quality (Frequency Response, Clarity)

3.5

Rating Criteria Explanation

The most crucial aspect of any speaker is its sound quality. Consider the frequency response range – a wider range (e.g., 20Hz - 20kHz) generally indicates the speaker can reproduce a broader spectrum of sounds, from deep bass to crisp highs. Clarity refers to how well you can distinguish individual instruments and vocals within a song. A speaker with good clarity will sound detailed and defined, while a speaker with poor clarity might sound muddy or muffled. Listen for distortion at higher volumes, which indicates the speaker is struggling to reproduce the sound accurately. Read reviews and, if possible, listen to the speaker in person or watch sound tests online before purchasing. Pay attention to descriptions of bass response (is it boomy or tight?), mid-range clarity (are vocals clear and present?), and treble detail (are high frequencies crisp without being harsh?).

Rating Comments

Offers loud and clear sound with solid bass, suitable for parties and home use. However, some users may find the sound quality not as described, with the bass potentially needing improvement. Overall, decent sound for the price range.

Battery Life

3.0

Rating Criteria Explanation

A portable speaker is only as good as its battery life. Consider how long you'll typically use the speaker between charges. If you plan on using it for long periods outdoors, like camping or at the beach, a longer battery life is essential. Pay attention to the stated battery life and read reviews to see if it matches real-world performance. Battery life is often specified at a moderate volume level; playing music at higher volumes will drain the battery faster. Also, consider the charging time. A speaker that takes a very long time to charge can be inconvenient. Some speakers also offer power bank functionality, allowing you to charge your phone or other devices, which can be a valuable feature.

Rating Comments

Advertised to have 15 hours of playtime, but some users have reported significantly shorter battery life (30-35 minutes). This inconsistency can be a major drawback, especially for outdoor use. Battery performance appears to be variable.

Durability and Water Resistance

4.0

Rating Criteria Explanation

Since it's a portable speaker, durability is key. Look for speakers with rugged designs that can withstand bumps, drops, and exposure to the elements. Water resistance is also important, especially if you plan on using the speaker near water (pool, beach, shower). IP ratings (e.g., IPX5, IPX7) indicate the level of water resistance. IPX5 means the speaker can withstand splashes of water, while IPX7 means it can be submerged in water for a short period. Consider the materials used in construction. Speakers with rubberized housings or reinforced corners are generally more durable. Read reviews to see how well the speaker holds up over time and in different conditions.

Rating Comments

Features an IPX6 waterproof rating, making it resistant to rain, spills, and splashes. This is ideal for outdoor activities like hiking, camping, and beach days. Build quality is generally good, but some users have reported speaker failure.

Bluetooth Connectivity and Range

4.0

Rating Criteria Explanation

Reliable Bluetooth connectivity is essential for a seamless listening experience. Look for speakers that support Bluetooth 5.0 or later, as these versions offer improved range, stability, and power efficiency. The stated Bluetooth range is also important, especially if you plan on moving around while using the speaker. A range of 30 feet or more is generally sufficient. Consider whether the speaker supports multi-point pairing, which allows you to connect to two devices simultaneously. This can be convenient if you want to switch between playing music from your phone and your tablet. Check reviews to see if users have experienced any connectivity issues, such as dropouts or difficulty pairing.

Rating Comments

Utilizes Bluetooth 5.4 for stable and fast connectivity with phones and other devices. The connection remains strong within the specified range of 33 feet, ensuring uninterrupted audio streaming. Pairing is generally quick and easy.

Portability and Size

4.0

Rating Criteria Explanation

The ideal size and weight of a portable Bluetooth speaker depend on how you plan to use it. If you want something that's easy to carry in a backpack or purse, a smaller and lighter speaker is preferable. However, smaller speakers often have limitations in sound quality and battery life. Consider the overall dimensions and weight of the speaker, and whether it has a convenient carrying handle or strap. If you plan on using the speaker primarily at home, a slightly larger and heavier model might be acceptable, as it can offer better sound quality. Think about where you'll be using it most often.

Rating Comments

The speaker is portable and easy to carry, making it suitable for various settings. Its size strikes a balance between portability and sound quality, fitting well in a backpack or for use around the house. Includes a lifting rope for easy transport.

Extra Features (Microphone, AUX Input, USB Charging)

4.0

Rating Criteria Explanation

Consider any extra features that might be useful to you. Some speakers have built-in microphones for taking calls or using voice assistants like Siri or Google Assistant. An AUX input allows you to connect devices that don't have Bluetooth, such as older MP3 players. USB charging ports can be used to charge your phone or other devices. Some speakers also have FM radio functionality or support for playing music from USB drives or microSD cards. Evaluate which features are important to you and choose a speaker that offers the right combination of features.

Rating Comments

Includes a built-in microphone for hands-free calling, AUX input, TF card support, and USB inputs, offering versatile connectivity options. These features enhance its usability for different devices and scenarios, providing added convenience.

Manufacturer Reliability and Warranty

3.0

Rating Criteria Explanation

The reliability of the manufacturer is a significant factor in the longevity and overall satisfaction with your Bluetooth speaker. Established brands with a good reputation are generally a safer bet, as they are more likely to offer reliable products and good customer support. Research the manufacturer's history and read reviews to see what other customers have experienced. A solid warranty is also crucial. A longer warranty period indicates that the manufacturer has confidence in the quality of their product. Check the terms of the warranty to understand what is covered and what is not. A good warranty can provide peace of mind and protect you from unexpected repair costs.

Rating Comments

Monster is a known brand, but some customer reviews indicate potential reliability issues, such as speaker failure and inconsistent battery life. The limited warranty may not provide sufficient coverage for all potential problems.

Cost Performance

4.0

Rating Criteria Explanation

Ultimately, you need to consider the cost performance of the Bluetooth speaker. This means evaluating the features and performance of the speaker relative to its price. A more expensive speaker might offer better sound quality, battery life, and durability, but it might not be worth the extra cost if you don't need those features. Read reviews and compare different models to see which offers the best value for your money. Don't automatically assume that the most expensive speaker is the best choice. Consider your budget and prioritize the features that are most important to you.

Rating Comments

Offers good value for its price, providing a combination of features and decent performance. While it may not match the sound quality of higher-end speakers, it is a cost-effective option for casual listening and outdoor activities, making it a worthwhile purchase.

Brand & Manufacturer Details

Monster

Monster offers a wide range of audio products, leveraging decades of sound engineering to deliver impactful music experiences.

Considerations

Avoid prolonged submersion in water
Do not expose to extreme temperatures
Limited warranty

Recommended For

Casual listeners
Outdoor enthusiasts
Users needing a budget-friendly portable speaker

Not Recommended For

Audiophiles seeking high-fidelity sound
Users requiring voice assistant support

Suitable For

Poolside gatherings
Camping trips
Home use

Not Suitable For

Quiet libraries
Formal business meetings
Professional audio monitoring

Frequently Asked Questions (FAQ)

Q.How is the sound quality of the Monster Shock Plus Bluetooth Speaker?

A.The Monster Shock Plus Bluetooth Speaker is designed with Monster's unique pure sound technology, delivering 30W of powerful audio with crystal-clear highs, deep bass, and an immersive sound experience. Staff confirmation indicates loud and clear sound with strong bass. Some staff members feel the bass could be better and the sound isn’t as good as described.

Q.How is the sound quality of the Monster Shock Plus Bluetooth Speaker?

Q.What are the connectivity options for this speaker?

A.The Monster Shock Plus Bluetooth Speaker offers multiple connectivity options, including Bluetooth 5.4, AUX input, TF card support, and USB inputs, providing flexibility for various audio sources.

Q.What are the connectivity options for this speaker?

A.The Monster Shock Plus Bluetooth Speaker offers multiple connectivity options, including Bluetooth 5.4, AUX input, TF card support, and USB inputs, providing flexibility for various audio sources.

Q.How long does the battery last on a single charge?

A.The Monster Shock Plus Bluetooth Speaker offers up to 10 hours of playtime on a single charge. However, some staff confirmation mentions that the battery life was poor, lasting only 30-35 minutes on a full charge.

Q.How long does the battery last on a single charge?

Q.Is the Monster Shock Plus Bluetooth Speaker waterproof?

A.Yes, the Monster Shock Plus Bluetooth Speaker has an IPX6 splash-proof rating, making it suitable for outdoor activities and resistant to rain, spills, and splashes.

Q.Is the Monster Shock Plus Bluetooth Speaker waterproof?

A.Yes, the Monster Shock Plus Bluetooth Speaker has an IPX6 splash-proof rating, making it suitable for outdoor activities and resistant to rain, spills, and splashes.

Q.Can I pair two of these speakers together for stereo sound?

A.Yes, the Monster Shock Plus Bluetooth Speaker supports True Wireless Stereo (TWS) pairing, allowing you to connect two speakers for a 60W stereo soundstage.

Q.Can I pair two of these speakers together for stereo sound?

A.Yes, the Monster Shock Plus Bluetooth Speaker supports True Wireless Stereo (TWS) pairing, allowing you to connect two speakers for a 60W stereo soundstage.

Q.Is it suitable for outdoor activities?

A.Yes, the Monster Shock Plus Bluetooth Speaker is designed for active lifestyles with its IPX6 splash-proof rating, making it an excellent companion for hiking, camping, beach days, and other outdoor activities.

Q.Is it suitable for outdoor activities?

Q.What is the Bluetooth version supported by this speaker?

A.The Monster Shock Plus Bluetooth Speaker supports Bluetooth 5.4, ensuring a stable and high-speed connection for smooth audio streaming.

Q.What is the Bluetooth version supported by this speaker?

A.The Monster Shock Plus Bluetooth Speaker supports Bluetooth 5.4, ensuring a stable and high-speed connection for smooth audio streaming.

Q.Does it have a built-in microphone for hands-free calling?

A.Yes, the Monster Shock Plus Bluetooth Speaker has a built-in microphone, allowing for hands-free calling with crystal-clear voice capture.

Q.Does it have a built-in microphone for hands-free calling?

A.Yes, the Monster Shock Plus Bluetooth Speaker has a built-in microphone, allowing for hands-free calling with crystal-clear voice capture.

Q.What are the dimensions of the speaker?

A.The Monster Shock Plus Bluetooth Speaker has product dimensions of 2.99"D x 10.08"W x 4.02"H.

Q.What are the dimensions of the speaker?

A.The Monster Shock Plus Bluetooth Speaker has product dimensions of 2.99"D x 10.08"W x 4.02"H.

Q.What is the warranty on this speaker?

A.The Monster Shock Plus Bluetooth Speaker comes with a limited warranty.

Q.What is the warranty on this speaker?

A.The Monster Shock Plus Bluetooth Speaker comes with a limited warranty.

SHOPSTAFF Rating Ranking

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Speaker Type	Outdoor N/A	Bluetooth Version	- N/A
Battery Life	24 hours	Water Resistance	Water Resistant N/A
Wireless Range	10 meters	Charging Time	24 hours
Weight	3000 grams	Dimensions	- mm
Supported Codecs	- N/A	Built-in Microphone	Yes N/A

Waterproof FunctionBuilt-in Microphone FunctionExternal Device Charging FunctionStereo Pairing FunctionPreset Equalizer FunctionVoice Assistant Activation Function

4.6Overall Rating

4.8Sound Quality (Frequency Response, Clarity)

4.9Battery Life

4.7Durability and Water Resistance

4.6Bluetooth Connectivity and Range

4.5Portability and Size

4.7Extra Features (Microphone, AUX Input, USB Charging)

4.5Manufacturer Reliability and Warranty

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Speaker Type	Component N/A	Bluetooth Version	5.3 N/A
Battery Life	24 hours	Water Resistance	Waterproof N/A
Wireless Range	- meters	Charging Time	1.5 hours
Weight	- grams	Dimensions	- mm
Supported Codecs	- N/A	Built-in Microphone	True N/A

Waterproof FunctionBuilt-in Microphone FunctionExternal Device Charging FunctionStereo Pairing FunctionPreset Equalizer FunctionVoice Assistant Activation Function

4.5Overall Rating

4.3Sound Quality (Frequency Response, Clarity)

4.8Battery Life

4.7Durability and Water Resistance

4.5Bluetooth Connectivity and Range

4.2Portability and Size

4.4Extra Features (Microphone, AUX Input, USB Charging)

4.5Manufacturer Reliability and Warranty

4.5Cost Performance

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Speaker Type	Stereo N/A	Bluetooth Version	- N/A
Battery Life	24 hours	Water Resistance	Waterproof N/A
Wireless Range	100 meters	Charging Time	24 hours
Weight	- grams	Dimensions	- mm
Supported Codecs	- N/A	Built-in Microphone	- N/A

Waterproof FunctionBuilt-in Microphone FunctionExternal Device Charging FunctionStereo Pairing FunctionPreset Equalizer FunctionVoice Assistant Activation Function

4.5Overall Rating

4.5Sound Quality (Frequency Response, Clarity)

4.8Battery Life

4.9Durability and Water Resistance

4.6Bluetooth Connectivity and Range

4.0Portability and Size

4.3Extra Features (Microphone, AUX Input, USB Charging)

4.5Manufacturer Reliability and Warranty

4.2Cost Performance

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Wireless Range	- meters	Charging Time	3 hours
Weight	997.9 grams	Dimensions	94 x 228.6 x 99 mm
Supported Codecs	- N/A	Built-in Microphone	- N/A

Waterproof FunctionBuilt-in Microphone FunctionExternal Device Charging FunctionStereo Pairing FunctionPreset Equalizer FunctionVoice Assistant Activation Function

4.5Overall Rating

4.3Sound Quality (Frequency Response, Clarity)

4.8Battery Life

4.9Durability and Water Resistance

4.5Bluetooth Connectivity and Range

4.2Portability and Size

4.6Extra Features (Microphone, AUX Input, USB Charging)

4.5Manufacturer Reliability and Warranty

4.0Cost Performance

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Wireless Range	- meters	Charging Time	3 hours
Weight	290 grams	Dimensions	- mm
Supported Codecs	- N/A	Built-in Microphone	No N/A

Waterproof FunctionBuilt-in Microphone FunctionExternal Device Charging FunctionStereo Pairing FunctionPreset Equalizer FunctionVoice Assistant Activation Function

4.3Overall Rating

4.0Sound Quality (Frequency Response, Clarity)

4.5Battery Life

4.8Durability and Water Resistance

4.3Bluetooth Connectivity and Range

5.0Portability and Size

3.0Extra Features (Microphone, AUX Input, USB Charging)

4.5Manufacturer Reliability and Warranty

4.5Cost Performance

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See more [2025 Edition] 99 Best Portable Bluetooth Speakers! Selection Guide and Latest Models Introduction comparisons

Monster Shock Plus Bluetooth Speaker Monster S21

Product Overview

Product Specifications

Size & Weight

Features

SHOPSTAFF Rating Score

Brand & Manufacturer Details

Considerations

Recommended For

Not Recommended For

Suitable For

Not Suitable For