Introduction
The Monster S380 is a portable Bluetooth speaker designed to deliver powerful audio with versatile connectivity. This manual provides essential information for setting up, operating, and maintaining your speaker to ensure optimal performance and longevity.

Image: The Monster S380 Portable Bluetooth Speaker, showcasing its sleek black design and robust build.
Package Contents
Please check the package for the following items:
- Monster S380 Bluetooth Speaker ×1
- USB-C Charging Cable ×1
- Portable Rope ×1
- Quick Start Guide ×1

Image: A visual representation of the Monster S380 speaker, USB-C charging cable, portable rope, and quick start guide included in the box.
Product Overview
Control Buttons
The Monster S380 features intuitive controls located on the top panel:
- Mode Switching (M): Press to cycle through input modes (Bluetooth, AUX, TF Card).
- Play/Pause (►▮): Press to play or pause audio.
- Power On/Off (●): Press and hold to power the speaker on or off.
- Volume Down / Previous Song (-): Press to decrease volume. Press and hold for the previous track.
- Volume Up / Next Song (+): Press to increase volume. Press and hold for the next track.

Image: Diagram illustrating the function of each control button on the Monster S380 speaker's top panel.
Input Interfaces
The speaker offers multiple input options for versatile connectivity:
- USB Port: For USB drive playback.
- TF Card Slot: For playing music directly from a TF (MicroSD) card.
- AUX-in Port: For wired connection to audio devices using a 3.5mm audio cable.
- Charging Port: USB-C port for charging the speaker.

Image: Close-up view of the Monster S380 speaker's input panel, showing the USB, TF card, AUX, and charging ports.
Setup
Charging the Speaker
Before first use, fully charge the speaker. Connect the provided USB-C charging cable to the speaker's charging port and the other end to a USB power adapter (not included) or a computer's USB port. The charging indicator light will show the charging status.
Power On/Off
- To Power On: Press and hold the Power button (●) for approximately 2-3 seconds until you hear an audible prompt.
- To Power Off: Press and hold the Power button (●) for approximately 2-3 seconds until you hear an audible prompt.
Bluetooth Pairing
The Monster S380 uses Bluetooth 6.0 for a stable connection.
- Ensure the speaker is powered on and in Bluetooth pairing mode (indicated by a flashing LED). If not, press the 'M' button to switch to Bluetooth mode.
- On your mobile device, enable Bluetooth and search for available devices.
- Select "Monster S380" from the list of devices.
- Once paired, the speaker will indicate a successful connection, and the LED will stop flashing.

Image: Illustration highlighting the advanced Bluetooth 6.0 technology within the Monster S380 speaker, indicating stable and efficient wireless connectivity.
True Wireless Stereo (TWS) Pairing
You can pair two Monster S380 speakers together for a true wireless stereo experience, providing a combined output of up to 80W.
- Ensure both Monster S380 speakers are powered on and not connected to any Bluetooth device.
- On one speaker (this will be the primary speaker), press and hold the 'M' button for 3 seconds. You will hear a prompt indicating TWS pairing mode.
- The primary speaker will automatically search for the secondary speaker. Once connected, you will hear a confirmation sound.
- Now, connect your mobile device to the primary speaker via Bluetooth as described in the Bluetooth Pairing section. Both speakers will play audio in stereo.

Image: Two Monster S380 speakers wirelessly connected, demonstrating the True Wireless Stereo (TWS) pairing feature for enhanced sound.
Operating Instructions
Basic Audio Controls
- Play/Pause: Press the Play/Pause button (►▮).
- Volume Adjustment: Press the '+' button to increase volume, and the '-' button to decrease volume.
- Next Track: Press and hold the '+' button.
- Previous Track: Press and hold the '-' button.
Hands-free Calling
When connected via Bluetooth, the built-in microphone allows for hands-free calls.
- Answer Call: Press the Play/Pause button (►▮) once.
- End Call: Press the Play/Pause button (►▮) once during a call.
- Reject Call: Press and hold the Play/Pause button (►▮) for 2 seconds.
AUX Mode
To use the speaker with a wired connection:
- Connect one end of a 3.5mm audio cable (not included) to the AUX-in port on the speaker.
- Connect the other end to the audio output of your device.
- Press the 'M' button on the speaker until it enters AUX mode.
TF Card Mode
To play music directly from a TF (MicroSD) card:
- Insert a TF card with audio files into the TF card slot.
- Press the 'M' button on the speaker until it enters TF Card mode. The speaker will automatically begin playing music from the card.
Maintenance
The Monster S380 speaker is designed for durability and features an IPX6 waterproof rating, making it resistant to splashes and rain. Follow these guidelines for proper care:
- Cleaning: Wipe the speaker with a soft, damp cloth. Do not use abrasive cleaners or solvents.
- Water Resistance: The IPX6 rating means the speaker can withstand powerful water jets. Do not submerge the speaker in water. Ensure the port cover is securely closed to maintain water resistance.
- Storage: Store the speaker in a cool, dry place away from extreme temperatures and direct sunlight.
- Battery Care: To prolong battery life, avoid fully discharging the speaker frequently. Charge it regularly, even if not in use for extended periods.

Image: The Monster S380 speaker positioned near a swimming pool, illustrating its IPX6 waterproof capability against splashes and rain.
Troubleshooting
If you encounter issues with your Monster S380 speaker, refer to the following common problems and solutions:
| Problem | Solution |
|---|---|
| Speaker does not power on. | Ensure the battery is charged. Connect the speaker to a power source using the USB-C cable and try again after a few minutes. |
| Cannot pair via Bluetooth. | Ensure the speaker is in Bluetooth pairing mode (flashing LED). Turn off and on Bluetooth on your device. Move the speaker closer to your device. Clear previous Bluetooth connections on your device. |
| No sound or low volume. | Increase the volume on both the speaker and your connected device. Ensure the correct input mode (Bluetooth, AUX, TF Card) is selected. Check if the speaker is muted. |
| TWS pairing fails. | Ensure both speakers are Monster S380 models and are not connected to any other Bluetooth devices. Try resetting both speakers and repeating the TWS pairing steps. |
| Audio distortion. | Reduce the volume on both the speaker and your device. Ensure the speaker is not too far from the Bluetooth source or that there are no obstructions. |
Specifications
Key technical specifications for the Monster S380 Portable Bluetooth Speaker:
| Feature | Detail |
|---|---|
| Model Name | MS62153 |
| Speaker Type | Outdoor |
| Material | Plastic |
| Connectivity Technology | Bluetooth 6.0, Auxiliary, USB |
| Audio Output Mode | Stereo |
| Speaker Maximum Output Power | 40 Watts |
| Waterproof Rating | IPX6 |
| Playtime | Up to 20 hours (at 50% volume) |
| Control Method | Push Button |
| Power Source | Battery Powered (1 AA battery included) |
| Product Dimensions | 21D x 8W x 8H Centimetres |
| Item Weight | 870 g |
Warranty and Support
The Monster S380 Portable Bluetooth Speaker comes with a limited warranty. Please refer to the warranty card included in your package for specific terms and conditions. For technical support, troubleshooting assistance, or warranty claims, please contact Monster customer service through their official website or the retailer where the product was purchased.





