Important Safety Instructions
Please read and follow all safety instructions before using this product. Keep this manual for future reference.
- Do not expose the speaker to extreme temperatures (hot or cold) or high humidity.
- Do not disassemble, repair, or modify the speaker. This may void the warranty and pose a safety risk.
- Use only the provided USB-C charging cable or a certified equivalent.
- Keep the speaker away from medical devices, as it contains magnets.
- The speaker is IPX6 waterproof, meaning it can withstand powerful water jets. Do not submerge the speaker in water. Ensure the charging port cover is securely closed before exposure to water.
- Avoid dropping the speaker or subjecting it to strong impacts.
- Dispose of the battery and speaker responsibly according to local regulations.
Package Contents
Verify that all items are present in your package:
- 1 x DOSS Extreme Boom Speaker
- 1 x Portable Strap
- 1 x USB-C Charging Cable
- 1 x User Manual
Product Overview
Familiarize yourself with the DOSS Extreme Boom speaker's components and controls.

Image: The DOSS Extreme Boom speaker, showcasing its robust design, integrated handle, and detachable portable strap.

Image: A detailed view of the speaker's top control panel with buttons for power, bass, play/pause, volume, and the rear port section including DC 5V (USB-C charging), USB-A (power bank out), AUX, and TF (MicroSD card) slots, protected by a rubber cover.
Controls and Ports:
- Power Button: Press and hold to power on/off.
- Bass Button: Activates/deactivates the enhanced bass mode.
- Play/Pause Button: Controls audio playback.
- Volume Up (+): Increases volume. Press and hold for next track.
- Volume Down (-): Decreases volume. Press and hold for previous track.
- USB-C Charging Port (DC 5V): For charging the speaker.
- USB-A Output Port (5V OUT): Functions as a power bank to charge external devices.
- AUX Input: For wired audio connection.
- TF Card Slot: For playing music directly from a MicroSD card.
Setup
Charging the Speaker
Before first use, fully charge the DOSS Extreme Boom speaker. The built-in 10400mAh rechargeable battery provides up to 30 hours of playtime at 50% volume.
- Open the rubber cover on the back of the speaker.
- Connect the provided USB-C charging cable to the DC 5V port on the speaker and to a USB power adapter (not included).
- The LED indicators will show charging status. All LEDs will be solid when fully charged. Charging typically takes about 6 hours.
The speaker also features a built-in power bank. You can charge your mobile devices by connecting them to the USB-A output port (5V OUT) on the speaker.

Image: A smartphone connected to the DOSS Extreme Boom speaker via a USB cable, illustrating the speaker's power bank functionality.
Powering On/Off
Press and hold the Power button for 2-3 seconds to turn the speaker on or off. A sound prompt will indicate the power status.
Operating Instructions
Bluetooth Pairing
The DOSS Extreme Boom uses Bluetooth 5.3 for stable wireless connection.
- Turn on the speaker. It will automatically enter Bluetooth pairing mode, indicated by a flashing blue LED.
- On your device (smartphone, tablet, etc.), enable Bluetooth and search for available devices.
- Select "DOSS Extreme Boom" from the list.
- Once connected, the blue LED will become solid, and you will hear a confirmation sound.
- The speaker will automatically reconnect to the last paired device when powered on, if within range (up to 66 feet).
Audio Playback
- Play/Pause: Press the Play/Pause button once.
- Volume Control: Press the '+' button to increase volume, and '-' button to decrease volume.
- Next Track: Press and hold the '+' button.
- Previous Track: Press and hold the '-' button.
Bass Boost Function
Press the dedicated BASS button on the control panel to activate or deactivate the enhanced bass mode. This feature amplifies low frequencies for a more powerful audio experience.
TWS Mode (True Wireless Stereo)
You can pair two DOSS Extreme Boom speakers together for a true wireless stereo sound experience.
- Ensure both speakers are powered on and not connected to any Bluetooth device.
- On one speaker, press and hold the Play/Pause button for 3 seconds until you hear a prompt indicating TWS pairing mode. This speaker will be the primary speaker.
- The second speaker will automatically connect to the primary speaker. You will hear a confirmation sound when TWS pairing is successful.
- Now, connect your device to the primary speaker via Bluetooth as described in the "Bluetooth Pairing" section. Audio will play through both speakers in stereo.

Image: Two DOSS Extreme Boom speakers positioned on a wooden dock next to people, demonstrating the True Wireless Stereo (TWS) pairing capability for an immersive sound experience.
AUX Input
To play audio from a device without Bluetooth, use the AUX input:
- Connect a 3.5mm audio cable (not included) from your device's audio output to the AUX port on the speaker.
- The speaker will automatically switch to AUX mode.
MicroSD Card Playback
The speaker supports playing audio directly from a MicroSD (TF) card.
- Insert a MicroSD card (up to 32GB, FAT32 format) with audio files into the TF card slot.
- The speaker will automatically detect the card and begin playing music.
Maintenance
Cleaning
Wipe the speaker with a soft, damp cloth. Do not use harsh chemicals or abrasive cleaners.
Water Resistance (IPX6)
The DOSS Extreme Boom is rated IPX6 waterproof, meaning it is protected against powerful water jets from any direction. This makes it suitable for outdoor use, near pools, or in light rain.

Image: The DOSS Extreme Boom speaker resting in a shallow stream with rocks, demonstrating its IPX6 water resistance for outdoor environments.
Important: IPX6 rating does NOT mean the speaker can be submerged in water. Always ensure the charging port cover is tightly sealed before exposing the speaker to water.
Troubleshooting
| Problem | Possible Solution |
|---|---|
| Speaker does not turn on. | Ensure the speaker is charged. Connect it to a power source using the USB-C cable. |
| Cannot pair with Bluetooth device. | Make sure the speaker is in pairing mode (flashing blue LED). Turn off Bluetooth on your device and turn it back on. Forget "DOSS Extreme Boom" from your device's Bluetooth list and try pairing again. Ensure no other devices are connected to the speaker. |
| No sound or distorted sound. | Adjust the volume on both the speaker and your connected device. Ensure the speaker is fully charged. If using AUX, check the cable connection. If using MicroSD, ensure the audio files are compatible and the card is properly inserted. |
| TWS pairing fails. | Ensure both speakers are not connected to any other Bluetooth device. Power both speakers off and on, then try TWS pairing again. Make sure they are within close proximity. |
| Speaker not charging. | Check the USB-C cable and power adapter. Ensure the cable is securely connected to the DC 5V port. Try a different cable or power source. |
Specifications
| Feature | Detail |
|---|---|
| Model Name | Extreme Boom |
| Speaker Type | Outdoor Bluetooth Speaker |
| Output Power | 60 Watts |
| Bluetooth Version | 5.3 |
| Bluetooth Range | Up to 66 Feet (20 meters) |
| Battery Capacity | 10400mAh (rechargeable) |
| Playtime | Up to 30 Hours (at 50% volume) |
| Charging Time | Approx. 6 Hours |
| Water Resistance | IPX6 |
| Dimensions (D x W x H) | 14.09" x 6.1" x 8.62" (35.8cm x 15.5cm x 21.9cm) |
| Item Weight | 4.6 Pounds (2.09 kg) |
| Connectivity | Bluetooth, AUX-in, MicroSD (TF) Card |
| Power Bank Output | Yes (USB-A) |
Warranty and Support
The DOSS Extreme Boom speaker comes with a 1-Year Warranty from the date of purchase, covering any quality-related concerns.

Image: A graphic indicating a one-year warranty for the product.
For any product issues or inquiries, please feel free to contact our customer support team. We are committed to providing you with 24-hour prompt assistance and support.

Image: A customer service representative wearing a headset, with contact information displayed: Phone number 1-833-275-3677 and email support@dossav.com.
Phone: 1-833-275-3677
Email: support@dossav.com





