1. Introduction
Thank you for choosing the DOSS SoundBox Pro+ P300 Bluetooth Speaker. This manual provides important information regarding the setup, operation, and maintenance of your new speaker. Please read this manual thoroughly before using the product to ensure proper function and safety.

Image: The DOSS SoundBox Pro+ P300 Bluetooth Speaker, showcasing its sleek violet design and illuminated LED accents.
2. Safety Information
To ensure safe operation and prevent damage, please observe the following precautions:
- Do not expose the speaker to extreme temperatures or direct sunlight for prolonged periods.
- Avoid dropping or subjecting the speaker to strong impacts.
- Do not disassemble, repair, or modify the speaker yourself. Refer all servicing to qualified personnel.
- Keep the speaker away from medical devices, as its magnetic field may interfere with their operation.
- Ensure the charging port is dry before connecting the charging cable.
- Use only the specified charging cable and adapter.
3. Package Contents
Verify that all items are present in your package:
- DOSS SoundBox Pro+ P300 Bluetooth Speaker
- Warranty Card
4. Product Overview
4.1 Components
The DOSS SoundBox Pro+ P300 features advanced audio components for a superior listening experience.

Image: An exploded view of the speaker's internal components, highlighting the two full-range speakers and DSP technology responsible for its 40W stunning sound.
The speaker is equipped with two full-range speakers and a passive radiator, delivering 40W of rich sound with enhanced bass. Dual DSP technologies reduce distortion and balance the audio output.
4.2 Controls and Ports
Familiarize yourself with the control buttons and ports on your speaker.

Image: Top view of the DOSS SoundBox Pro+ P300, illustrating the control panel with buttons like Power, Mode, Play/Pause, Volume, and the prominent EXTRA BASS button, along with the 7-inch large passive radiator.
- Power Button: Turns the speaker on/off.
- Mode Button: Switches between Bluetooth, AUX, and Micro SD card modes.
- Play/Pause Button: Plays or pauses audio.
- Volume Buttons (+/-): Adjusts volume.
- EXTRA BASS Button: Enhances bass. Press and hold for 2 seconds to turn off the light show.
- ADD Button: Used for True Wireless Stereo (TWS) pairing.
- Charging Port: USB port for charging.
- AUX-in Port: For wired audio connection.
- Micro SD Card Slot: For playing music directly from a Micro SD card.
5. Setup
5.1 Charging the Speaker
Before first use, fully charge the speaker. The battery life is approximately 20 hours on a single charge, with a charging time of about 3.5 hours.
- Connect the charging cable to the speaker's charging port.
- 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 show the charging status. It will turn off or change color when fully charged.
5.2 Bluetooth Pairing
Pair your DOSS SoundBox Pro+ P300 with your Bluetooth-enabled device.
- Turn on the speaker by pressing the Power button. The speaker will enter Bluetooth pairing mode automatically, indicated by a flashing LED light.
- Enable Bluetooth on your device (smartphone, tablet, computer, etc.).
- Search for "DOSS SoundBox Pro+ P300" in your device's Bluetooth list and select it to connect.
- Once connected, the LED indicator will stop flashing and remain solid.
Note: The speaker will automatically reconnect to the last paired device if it is within range and Bluetooth is enabled.
6. Operating Instructions
6.1 Basic Functions
- Power On/Off: Press and hold the Power button.
- Volume Control: Press the '+' button to increase volume, '-' button to decrease volume.
- Play/Pause: Press the Play/Pause button.
- Next Track: Press and hold the '+' button for 2 seconds.
- Previous Track: Press and hold the '-' button for 2 seconds.
- Change Mode: Press the Mode button to cycle through Bluetooth, AUX, and Micro SD card modes.
6.2 Enhanced Bass Function
Press the EXTRA BASS button to activate deeper bass. Press it again to deactivate.
6.3 Dynamic Light Show
The speaker features a dynamic light show that syncs with your music, offering six colorful lighting modes.

Image: The DOSS SoundBox Pro+ P300 speaker illuminated with its vibrant, beat-synced light show, creating an engaging visual experience.
To turn off the light show, press and hold the EXTRA BASS button for 2 seconds.
6.4 True Wireless Stereo (TWS) Pairing
Connect two DOSS SoundBox Pro+ P300 speakers for a more immersive stereo sound experience.

Image: Two DOSS SoundBox Pro+ P300 speakers positioned to demonstrate True Wireless Stereo (TWS) pairing, providing a wider and more powerful soundstage.
- Ensure both speakers are powered on and in Bluetooth pairing mode (not connected to any device).
- On one speaker, press the ADD button. It will search for the second speaker.
- Once connected, you will hear an audible confirmation. The LED indicators on both speakers will change to indicate a successful TWS connection.
- Now, connect your device to one of the speakers via Bluetooth. Audio will play through both speakers in stereo.
Note: TWS pairing works only with two DOSS SoundBox Pro+ P300 speakers.
6.5 IPX6 Waterproof Rating
The DOSS SoundBox Pro+ P300 has an IPX6 waterproof rating, making it suitable for outdoor use and resistant to strong water jets.

Image: The DOSS SoundBox Pro+ P300 speaker positioned near a swimming pool, illustrating its IPX6 waterproof capability, ideal for beach or poolside use.
Caution: While IPX6 rated, avoid submerging the speaker completely for extended periods. Ensure the charging port cover is securely closed before exposure to water.
7. Maintenance
7.1 Cleaning
- Wipe the speaker with a soft, damp cloth.
- Do not use abrasive cleaners, alcohol, or chemical solvents.
- Ensure the speaker is dry before charging or storing.
7.2 Storage
- Store the speaker in a cool, dry place away from direct sunlight and extreme temperatures.
- If storing for an extended period, charge the battery every 3-6 months to maintain battery health.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Speaker does not turn on. | Low battery. | Charge the speaker fully. |
| Cannot pair with Bluetooth device. | Speaker not in pairing mode; device Bluetooth off; too far from speaker. | Ensure speaker is in pairing mode. Turn device Bluetooth on/off. Move device closer to speaker. |
| No sound. | Volume too low; incorrect input mode; device not connected. | Increase volume. Press Mode button to select correct input. Reconnect Bluetooth device. |
| Sound distortion. | Volume too high; audio source quality. | Decrease volume. Try a different audio source. |
| TWS pairing fails. | Speakers already connected to a device; too far apart. | Disconnect speakers from any devices. Ensure speakers are close to each other. |
9. Specifications
| Feature | Detail |
|---|---|
| Model Name | SoundBox Pro+ P300 |
| Brand | DOSS |
| Output Power | 40W |
| Connectivity Technology | Bluetooth |
| Battery Life | Up to 20 hours |
| Charging Time | Approx. 3.5 hours |
| Waterproof Rating | IPX6 |
| Dimensions (L x W x H) | 26.2 x 8.4 x 9.1 cm |
| Weight | 1.26 Kilograms |
| Compatible Devices | MP3 Player, Desktop Computer, Laptop, Projector, Smartphone, Tablet, Television |
| Material | Polycarbonate (PC), Acrylonitrile Butadiene Styrene (ABS), Iron |
10. Warranty and Support
Your DOSS SoundBox Pro+ P300 comes with a limited warranty. Please refer to the included Warranty Card for detailed terms and conditions.
For technical support or customer service, please visit the official DOSS website or contact their customer support channels as indicated on the Warranty Card or product packaging.





