Monster Bluetooth Speaker Round One - Waterproof Portable with Big

In this review of the Monster Bluetooth Speaker Round One, the bottom line is simple: this compact, rugged portable speaker is best for listeners who want loud, punchy sound and reliable waterproofing for showers, beaches, and outdoor days. The single biggest reason to buy is the speaker's emphasis on audio engineering - designed by Noel Lee and the Monster team to deliver deep bass, clear treble and no distortion at higher volumes. It is presented as a travel-ready, easy-to-carry unit with long battery life, and that combination makes it a practical choice for active users who value sound quality in wet environments.

Key Features

• Pure Monster Sound: Engineered by Noel Lee and the Monster team to deliver strong dynamics, clear detail, and substantial deep bass without distortion at typical listening levels.
• IPX8 Waterproof: Fully immersible up to about 1 meter for roughly 30 minutes, so it withstands shower use, poolside splashes and beach days without worry.
• Bluetooth 5.4: Modern Bluetooth connectivity offers faster pairing and stable wireless range for streaming from phones, tablets or other Bluetooth devices.
• Portable design: Compact size with a lanyard, detachable suction cup and carabiner-ready hook makes it simple to attach to backpacks, bikes or bathroom tiles.
• Long battery life: Built-in rechargeable li-ion battery claims up to 24 hours of playback at appropriate volume, keeping music playing from day to night.
• Hands-free calling: Built-in microphone enables clear hands-free calls while on the go or in the home.

Who It's For

The Monster Round One is well suited for people who want a small, durable speaker with a focus on sound quality and waterproofing: commuters who like to listen on the move, beachgoers who need a speaker that tolerates sand and splashes, and anyone who uses a speaker in the shower. The long battery life and rugged attachments make it especially useful for short trips and outdoor activities.

Those seeking audiophile-level fidelity, multichannel pairing for true stereo from two units, or a speaker with smart assistant integration should look elsewhere, because this product is targeted at robust, portable performance and practical waterproofing rather than advanced multiroom features.

Pros & Cons

Pros

• Strong, punchy bass and clear treble reflecting the Pure Monster Sound engineering approach.
• IPX8 waterproof rating allows safe use in showers and short immersion for water activities.
• Bluetooth 5.4 provides quick pairing and stable wireless connection.
• Compact, travel-friendly form with lanyard, suction cup and carabiner hook for versatile mounting.

Cons

• While lively and full, the sound may not replace larger speakers for listeners wanting very high-volume, room-filling performance.
• Some advanced features common on bigger models, like multiroom or voice assistant support, are not present.

Specifications

Brand	Monster
Model	Round One Bluetooth Speaker
Waterproof Rating	IPX8 (immersible up to 1 meter for ~30 minutes)
Bluetooth	Bluetooth 5.4
Battery Life	Up to 24 hours playback (at appropriate volume)
Accessories	Lanyard, detachable suction cup, built-in hook/carabiner
Other	Built-in microphone for hands-free calls

Our Verdict

The Monster Round One is a strong choice for anyone who wants dependable waterproofing and impactful, distortion-free sound in a truly portable package. Its combination of engineered audio, Bluetooth 5.4 stability and long battery life makes it good value for active users who need music on the move, in the shower, or at the beach; buyers who need advanced smart features or larger-scale volume should consider a bigger system.

Frequently Asked Questions

Is this speaker safe to use in the shower?
Yes. The IPX8 rating means it can be fully immersed up to about 1 meter for about 30 minutes, so shower and splashes are fine.

How long does the battery last?
The built-in rechargeable li-ion battery provides up to 24 hours of continuous playback at appropriate volume levels after a full charge.

Can I hang it on a backpack or bike?
Yes. The speaker includes a built-in hook for a carabiner and a lanyard, making it easy to attach to backpacks, bicycles or other gear.