Introduction
Thank you for choosing the Monster S290 Portable Bluetooth Speaker. This manual provides essential information for setting up, operating, and maintaining your speaker to ensure optimal performance and longevity. Please read these instructions carefully before using the product.

Image: The Monster S290 speaker, designed for portability, shown being carried by a person outdoors.
Package Contents
Verify that all items listed below are included in your package:
- Monster S290 Speaker x1
- AUX-IN Cable x1
- USB-C Charging Cable x1
- Quick Start Guide x1
- Warranty Card x1

Image: A visual representation of the Monster S290 speaker and its included accessories: AUX-IN cable, USB-C charging cable, quick start guide, and warranty card.
Product Overview
Speaker Layout

Image: The Monster S290 Portable Bluetooth Speaker, showcasing its cylindrical design, control buttons on top, and integrated carrying strap.
Control Buttons

Image: A diagram detailing the functions of the speaker's buttons: Power On/Off/Mode Switching, Volume Down/Previous Song, Volume Up/Next Song, and Play/Pause.
- Power Button (⏻): Press and hold to power on/off. Short press to switch between input modes (Bluetooth, AUX, TF Card, USB).
- Volume Down / Previous Song (⏮): Short press for previous song. Press and hold to decrease volume.
- Play / Pause (⏯): Short press to play or pause audio.
- Volume Up / Next Song (⏭): Short press for next song. Press and hold to increase volume.
Input Ports

Image: A detailed view of the speaker's connectivity panel, showing the TF card slot, USB port, USB-C charging port, and AUX-IN port, protected by a rubber flap.
- TF Card Slot: For playing audio directly from a MicroSD/TF card.
- USB Port: For playing audio directly from a USB flash drive.
- USB-C (DC 5V): Charging port for the speaker.
- AUX-IN: 3.5mm audio input for wired connection to devices.
Setup
Charging the Speaker
- Connect the provided USB-C charging cable to the USB-C port on the speaker.
- Connect the other end of the cable to a USB power adapter (not included) or a computer's USB port.
- The charging indicator light will illuminate during charging and turn off when fully charged.
- A full charge provides approximately 15 hours of playtime.

Image: The Monster S290 speaker held in a hand, visually representing its extended battery life of up to 15 hours on a single charge.
Power On/Off
- To Power On: Press and hold the Power button (⏻) for approximately 2-3 seconds until you hear an audible prompt and the indicator light turns on.
- To Power Off: Press and hold the Power button (⏻) for approximately 2-3 seconds until you hear an audible prompt and the indicator light turns off.
Operating Instructions
Bluetooth Pairing (Single Speaker)
- Ensure the speaker is powered on and in Bluetooth pairing mode (indicated by a flashing blue LED). If not, short press the Power button (⏻) to cycle through modes until Bluetooth mode is active.
- On your mobile device (smartphone, tablet, etc.), enable Bluetooth.
- Search for available Bluetooth devices. You should see "Monster S290" in the list.
- Select "Monster S290" to connect. Once connected, the indicator light will turn solid blue, and you will hear a confirmation sound.
- The speaker will automatically attempt to reconnect to the last paired device when powered on.

Image: An X-ray view of the Monster S290 speaker, emphasizing the integrated Bluetooth 6.0 chip for stable and efficient wireless connectivity.
TWS (True Wireless Stereo) Pairing
TWS pairing allows you to connect two Monster S290 speakers together for a stereo sound experience.
- Ensure both Monster S290 speakers are powered on and not connected to any Bluetooth device.
- On one of the speakers (this will be the primary speaker), press and hold the Play/Pause button (⏯) for 2-3 seconds. You will hear a prompt indicating TWS pairing mode.
- The two speakers will automatically search for and connect to each other. Once connected, you will hear a confirmation sound, and the primary speaker's indicator light will flash, while the secondary speaker's light will be solid.
- Now, connect your mobile device to the primary speaker via Bluetooth as described in the "Bluetooth Pairing" section.
- Audio will now play in stereo through both speakers.

Image: Two Monster S290 speakers demonstrating TWS connectivity, allowing them to play audio in stereo from a single Bluetooth source.
AUX-IN Mode
- Connect one end of the 3.5mm AUX-IN cable to the AUX-IN port on the speaker.
- Connect the other end of the cable to the audio output jack of your device.
- Short press the Power button (⏻) to switch to AUX mode. The speaker will announce "AUX mode".
- Control playback and volume from your connected device.
TF Card Playback Mode
- Insert a TF (MicroSD) card with audio files into the TF card slot.
- Short press the Power button (⏻) to switch to TF Card mode. The speaker will announce "TF card mode" and begin playing audio.
- Use the speaker's control buttons for playback (Play/Pause, Next/Previous Song, Volume Up/Down).
USB Playback Mode
- Insert a USB flash drive with audio files into the USB port.
- Short press the Power button (⏻) to switch to USB mode. The speaker will announce "USB mode" and begin playing audio.
- Use the speaker's control buttons for playback (Play/Pause, Next/Previous Song, Volume Up/Down).

Image: The Monster S290 speaker connected to a laptop, illustrating its versatility with AUX, USB, and TF card input options.
Maintenance
Water Resistance (IPX6)
The Monster S290 speaker features an IPX6 waterproof rating, meaning it is protected against high-pressure water jets from any direction. This makes it suitable for outdoor use and resistant to splashes, rain, and sweat.
- Ensure the rubber flap covering the charging and input ports is securely closed to maintain water resistance.
- Do not submerge the speaker in water.
- After exposure to water, wipe the speaker dry with a soft cloth before charging or opening the port cover.

Image: The Monster S290 speaker positioned near a pool, illustrating its IPX6 waterproof capability, making it suitable for use in wet environments.
Cleaning and Storage
- Clean the speaker with a soft, damp cloth. Do not use abrasive cleaners or solvents.
- Store the speaker in a cool, dry place away from direct sunlight and extreme temperatures.
- If storing for an extended period, charge the battery periodically to maintain its health.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Speaker does not power on. | Low battery. | Charge the speaker using the provided USB-C cable. |
| No sound. | Volume too low on speaker or connected device. Incorrect input mode. | Increase volume on both speaker and device. Ensure correct input mode is selected (Bluetooth, AUX, TF, USB). |
| Cannot pair via Bluetooth. | Speaker not in pairing mode. Device Bluetooth is off. Speaker already connected to another device. | Ensure speaker is in Bluetooth pairing mode (flashing blue LED). Turn on Bluetooth on your device. Disconnect from other devices or restart the speaker. |
| TWS pairing fails. | Speakers are too far apart. One speaker is already paired to a device. | Ensure speakers are within 10 meters of each other. Disconnect both speakers from any Bluetooth devices before initiating TWS pairing. |
| Poor sound quality. | Low battery. Device too far from speaker (Bluetooth). Interference. | Charge the speaker. Move device closer to the speaker. Avoid obstacles between device and speaker. |
Specifications
- Model Name: S290 (Item Model Number: S38)
- Brand: Monster
- Bluetooth Version: 6.0
- Audio Output: 30W
- Playtime: Up to 15 hours (varies by volume and content)
- Waterproof Rating: IPX6
- Input Interfaces: Bluetooth, AUX-IN, TF Card, USB
- Charging Port: USB-C (DC 5V)
- Battery: 1 A battery (included)
- Product Dimensions: 2.36 x 7.24 x 2.68 inches
- Item Weight: 1.08 pounds
- Material: Plastic
- Color: Black
Warranty and Support
The Monster S290 Portable Bluetooth Speaker comes with a warranty. Please refer to the included "Warranty Card" for detailed terms and conditions. For further assistance or technical support, please consult the "Quick Start Guide" or visit the official Monster support website.
Keep your purchase receipt as proof of purchase for warranty claims.





