Introduction
Thank you for purchasing the CUPEISI WP-03B Bluetooth Wireless Speaker. This manual provides essential information for the safe and efficient use of your speaker. Please read it thoroughly before use and retain it for future reference.
The WP-03B is a compact, portable, and waterproof Bluetooth speaker designed for versatile audio playback. It features a built-in microphone for hands-free calls, long battery life, and multiple connectivity options.
Safety Information
- Do not expose the speaker to extreme temperatures, direct sunlight, or open flames.
- Avoid dropping or subjecting the speaker to strong impacts.
- Keep the speaker away from children and pets.
- Do not attempt to disassemble, repair, or modify the speaker yourself. Contact qualified service personnel if needed.
- Ensure all port covers are securely closed when using the speaker near water to maintain its IPX5 waterproof rating.
- Use only the provided charging cable or a certified equivalent.
Package Contents
- CUPEISI WP-03B Bluetooth Wireless Speaker
- USB Type-C Charging Cable
- Quick Start Guide
- Keychain
Product Overview
Familiarize yourself with the speaker's components:

Image: CUPEISI WP-03B Bluetooth Speaker, black, with a carrying strap. This image shows the speaker's compact design and the attached strap for portability.
- Power Button: Press and hold to power on/off. Short press for play/pause.
- Volume Up (+): Short press to increase volume. Long press for next track.
- Volume Down (-): Short press to decrease volume. Long press for previous track.
- Mode Button (M): Short press to switch between Bluetooth, AUX, and microSD modes.
- LED Indicator: Shows power status, charging status, and Bluetooth pairing status.
- USB Type-C Port: For charging the speaker.
- AUX Input: For wired audio connection.
- MicroSD Card Slot: For playing music directly from a microSD card.
- Microphone: For hands-free calling.

Image: CUPEISI WP-03B Bluetooth Speaker showing its multi-functional connectivity ports: USB-C for charging, AUX input, and a microSD card slot. This highlights the various ways to connect audio sources.
Setup
1. Charging the Speaker
- Connect the provided USB Type-C 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 LED indicator will show charging status. It will turn off or change color when fully charged.
- A full charge takes approximately 2-3 hours.
2. Powering On/Off
- To Power On: Press and hold the Power button for 2-3 seconds until you hear an audible prompt and the LED indicator lights up.
- To Power Off: Press and hold the Power button for 2-3 seconds until you hear an audible prompt and the LED indicator turns off.
3. Bluetooth Pairing
- Ensure the speaker is powered on and in Bluetooth mode (the LED indicator will flash blue). If not, short press the 'M' (Mode) button to switch to Bluetooth mode.
- Enable Bluetooth on your device (smartphone, tablet, PC).
- Search for "WP-03B" in your device's Bluetooth settings.
- Select "WP-03B" to connect. Once paired, you will hear a confirmation sound, and the LED indicator will turn solid blue.
- The speaker will automatically reconnect to the last paired device when powered on, if the device's Bluetooth is active and within range.

Image: CUPEISI WP-03B Bluetooth Speaker connected wirelessly to a smartphone displaying a music player interface. This illustrates the speaker's wireless connectivity.
4. TWS (True Wireless Stereo) Pairing (for two WP-03B speakers)
- Ensure both WP-03B speakers are powered off.
- Power on both speakers. They will enter Bluetooth pairing mode.
- On one of the speakers (this will be the primary speaker), double-press the Power button. The speakers will attempt to pair with each other.
- Once successfully paired, you will hear a confirmation sound, and the LED indicator on the primary speaker will flash blue, while the secondary speaker's LED will be solid blue.
- Now, connect your device to the primary speaker via Bluetooth as described in step 3. Audio will play in stereo through both speakers.
Operating Instructions
1. Music Playback
- Play/Pause: Short press the Power button.
- Volume Up: Short press the '+' button.
- Volume Down: Short press the '-' button.
- Next Track: Long press the '+' button.
- Previous Track: Long press the '-' button.
2. Hands-Free Calling
When connected via Bluetooth to your smartphone:
- Answer Call: Short press the Power button.
- End Call: Short press the Power button during a call.
- Reject Call: Long press the Power button.
- Note: For optimal microphone performance during calls, it is recommended to remove the silicone cover at the bottom of the speaker to enhance sound pickup.
3. Mode Switching
Short press the 'M' (Mode) button to cycle through available modes:
- Bluetooth Mode: For wireless connection to devices.
- AUX Mode: For wired connection using a 3.5mm audio cable (not included).
- MicroSD Card Mode: For playing audio files directly from an inserted microSD card.
4. LED Lighting
The speaker features automatic aurora LED lighting. The lights will cycle through various colors during operation.

Image: Four CUPEISI WP-03B Bluetooth Speakers displaying automatic aurora LED lighting in green, yellow, pink, and blue. This shows the speaker's dynamic lighting feature.
Maintenance
- Cleaning: Wipe the speaker with a soft, damp cloth. Do not use abrasive cleaners or solvents.
- Storage: Store the speaker in a cool, dry place away from direct sunlight and extreme temperatures.
- Battery Care: To prolong battery life, charge the speaker at least once every three months if not used regularly.
Troubleshooting
| Problem | Possible Solution |
|---|---|
| Speaker does not power on. | Ensure the speaker is charged. Connect it to a power source and try again. |
| Cannot pair via Bluetooth. | Make sure the speaker is in Bluetooth pairing mode (flashing blue LED). Turn off and on your device's Bluetooth. Forget "WP-03B" from your device's Bluetooth list and try pairing again. Ensure the speaker is not connected to another device. |
| No sound or low volume. | Increase the volume on both the speaker and your connected device. Ensure the correct mode (Bluetooth, AUX, microSD) is selected. Check if the audio cable is properly connected in AUX mode. |
| Poor call quality. | Ensure the silicone cover at the bottom of the speaker is removed to improve microphone sensitivity. Move closer to the speaker. Check network signal on your phone. |
| TWS pairing fails. | Ensure both speakers are WP-03B models and are powered off before attempting TWS pairing. Follow the TWS pairing steps carefully. |
Specifications
| Feature | Detail |
|---|---|
| Model Name | WP-03B |
| Speaker Type | 3D Speaker |
| Compatible Devices | Smartphones, Tablets, Laptops |
| Color | Black |
| Included Components | Quick Start Guide, Power Cable |
| Product Dimensions | 4D x 7.5W x 7.5H cm |
| Product Weight | 135 grams |
| Wireless Technology | Bluetooth 5.3 |
| Battery Capacity | 1000mAh Lithium-ion |
| Continuous Playback Time | Up to 12 Hours |
| Manufacturer | CUPEISI |
| Output Wattage | 5 W |
| Frequency Response | 60 KHz |
| Connectivity Technology | AUX, Bluetooth |
| Audio Output Mode | Mono (Stereo with TWS pairing) |
| Waterproof Rating | IPX5 |
Warranty and Support
This product comes with a 1-year warranty from the date of purchase. Please retain your proof of purchase for warranty claims.
For technical support or warranty inquiries, please contact CUPEISI customer service through your retailer or the official CUPEISI website.
Compliance Information
This device complies with relevant technical standards for radio wave emitting devices. You can view the Certificate of Compliance for this Wireless Speaker (Model WP-03B) by clicking the link below:
View Certificate of Compliance

Image: MiCOM Labs Certificate of Compliance for the Wireless Speaker, model WP-03B, confirming technical standards conformity. This document verifies the product meets necessary regulatory requirements.





