Introduction
The Monster Round One Portable Wireless Speaker is designed to deliver high-quality audio with robust bass in a compact, durable, and waterproof form factor. This manual provides essential information for setting up, operating, and maintaining your speaker to ensure optimal performance and longevity.

Image: Monster Round One Portable Wireless Speaker in Ink Black.
What's in the Box
Upon unboxing your Monster Round One speaker, you should find the following items:
- 1 x Monster Round One Bluetooth Speaker
- 1 x USB-A to USB-C Charging Cable
- 1 x 3.5mm AUX Cable
- 1 x Detachable Suction Cup
- 1 x Locking Climbing Carabiner Clip
- 1 x Quick Start Guide
- 1 x User Manual (this document)

Image: The Monster Round One speaker with its included accessories: charging cable, AUX cable, carabiner, and suction cup.
Video: An overview of the Monster Round One Bluetooth Speaker and its contents.
Product Features
- Pure Monster Sound: Engineered for impactful music with deep bass, clarity, and no distortion.
- IPX8 Waterproof: Designed to withstand water immersion, making it suitable for showers, beaches, and outdoor use.
- Bluetooth 5.4: Provides a seamless and stable wireless connection for your devices.
- Long Playtime: Built-in rechargeable battery offers extended hours of continuous music playback.
- Built-in Microphone: Enables clear hands-free calling.
- Wireless Dual Pairing (TWS): Connect two Monster Round One speakers for enhanced stereo sound.
- Portable Design: Compact and lightweight, includes a lanyard, detachable suction cup, and carabiner for versatile carrying and placement.
- 360-Degree Sound: Delivers immersive audio experience in all directions.

Image: The speaker's IPX8 waterproof capability, shown with a person underwater.
Video: Demonstrating the Monster speaker's portable and waterproof features with deep bass.

Image: Seamless Bluetooth 5.4 connection for a smooth listening experience.

Image: The speaker's built-in long-lasting battery provides worry-free use for a whole day.

Image: Wireless Dual Pairing allows connecting two speakers for enhanced stereo sound.

Image: The speaker's ultra-durable and portable design with a hasp for easy attachment.

Image: The speaker is built for shower use, attaching to the wall with a suction cup.
Setup
1. Charging the Speaker
Before first use, fully charge your Monster Round One speaker. Connect the provided USB-C charging cable to the speaker's charging port (located under the waterproof flap) and the other end to a USB power source. The LED indicator will show charging status.
2. Bluetooth Pairing
- Press and hold the Power button on the speaker for 3 seconds to turn it on. The LED indicator will flash, indicating it's in pairing mode.
- On your device (smartphone, tablet, etc.), enable Bluetooth and search for available devices.
- Select "Monster Round One" from the list of available devices.
- Once connected, the LED indicator will turn solid, and you will hear an audible confirmation.

Image: The speaker's front panel with play/pause and volume controls.
3. Wireless Dual Pairing (TWS)
To connect two Monster Round One speakers for true wireless stereo sound:
- Ensure both speakers are powered on and not connected to any other Bluetooth device.
- On one speaker (this will be your primary speaker), double-press the 'M' (Mode) button. The speaker will enter TWS pairing mode.
- The primary speaker will automatically search for and connect to the secondary speaker.
- Once connected, the LED indicators on both speakers will confirm the TWS connection.
- Now, connect your device to the primary speaker via Bluetooth as described in step 2.
Video: A quick guide to setting up the Monster Round One speaker, including pairing.
Operating Instructions
Button Functions
- Power Button (Side): Press and hold for 3 seconds to power on/off. Short press to activate voice assistant (Siri/Huawei).
- Mode Button (Side): Short press to switch between Bluetooth and AUX modes. Double-press for TWS pairing.
- Play/Pause Button (Front): Short press to play or pause music. During a call, short press to answer/end a call. Long press to reject a call. Double-press to redial the last number.
- Volume Up (+) Button (Front): Short press to increase volume. Long press for next track.
- Volume Down (-) Button (Front): Short press to decrease volume. Long press for previous track.
Hands-free Calling
With the built-in microphone, you can answer calls directly through the speaker when connected via Bluetooth. Use the Play/Pause button to manage calls.

Image: Internal components illustrating the speaker's powerful 15W output and dynamic audio performance.
Maintenance
Waterproof Care
To maintain the IPX8 waterproof rating, ensure the rubber flap covering the charging and AUX ports is securely closed when not in use. Avoid exposing the speaker to saltwater or chemicals, as this may degrade its waterproof seals over time. Rinse with fresh water after exposure to pool or ocean water.
Cleaning
Wipe the speaker with a soft, damp cloth. Do not use abrasive cleaners or solvents. Ensure the speaker is dry before charging or opening the port cover.
Video: Demonstrating the IPX8 waterproof capabilities of the Monster Bluetooth Speaker.
Troubleshooting
- No Power: Ensure the speaker is fully charged. Connect to a power source and check the charging indicator.
- No Sound: Check the volume level on both the speaker and your connected device. Ensure the speaker is correctly paired via Bluetooth or connected via AUX.
- Bluetooth Pairing Issues: Make sure the speaker is in pairing mode (flashing LED). Disconnect the speaker from any previously paired devices. Try restarting both the speaker and your device.
- Poor Sound Quality: Ensure the speaker is within the Bluetooth range of your device. Check for obstructions between the speaker and device. If using AUX, ensure the cable is fully inserted and undamaged.
- TWS Pairing Failure: Ensure both speakers are not connected to any other devices before attempting TWS pairing. Follow the TWS pairing instructions carefully.
Specifications
| Feature | Detail |
|---|---|
| Model Name | MS62116 |
| Brand | Monster |
| Speaker Type | Portable Speaker |
| Connectivity Technology | Bluetooth 5.4 |
| Waterproof Rating | IPX8 |
| Speaker Maximum Output Power | 15 Watts |
| Audio Output Mode | Stereo (with TWS) |
| Battery | 1 CR5 battery (included) |
| Item Weight | 9.9 ounces |
| Product Dimensions | 3.9"D x 1.7"W x 3.9"H |
| Material | Plastic |
Warranty and Support
Your Monster Round One Portable Wireless Speaker comes with a standard manufacturer's warranty. Please refer to the packaging or the official Monster website for specific warranty terms and conditions. For technical support, troubleshooting assistance, or to inquire about replacement parts, please contact Monster customer service through their official channels.





