1. Introduction
The Onforu SK03 Portable Bluetooth Speaker is designed for cycling enthusiasts and outdoor activities. It features a robust, waterproof design, loud sound output, and a long-lasting battery, making it suitable for various environments including biking, travel, and shower use. This manual provides detailed instructions for setting up, operating, and maintaining your speaker.
2. What's in the Box
Verify that all components are present upon unpacking:
- Bluetooth Speaker x 1
- Cycling Mount x 1
- Clip x 1
- Rubber for Size Adjustment x 2
- USB Cable 60cm x 1
- Audio Cable 100cm x 1
- English User Manual x 1

3. Product Overview
Familiarize yourself with the speaker's components and controls:

- Micro USB Port: For charging the speaker.
- AUX Port: For wired audio connection.
- Indicator Light: Displays power and connection status.
- Microphone: For hands-free calls.
- Volume Up / Next Button (+): Short press for volume up, long press for next track.
- Play / Pause / Power ON/OFF Button: Controls power, playback, and mode switching.
- Volume Down / Previous Button (-): Short press for volume down, long press for previous track.
- Cycling Mount: Securely attaches the speaker to bicycle handlebars.
4. Setup
4.1 Charging the Speaker
Before first use, fully charge the speaker.
- Connect the provided USB cable to the Micro USB port on the speaker.
- Connect the other end of the USB cable to a 5V USB power adapter (not included) or a computer USB port.
- The indicator light will illuminate during charging and turn off when fully charged.
4.2 Mounting on a Bicycle
The speaker comes with a cycling mount for secure attachment to your bike handlebars.
- Attach the cycling mount to your bicycle handlebars. Use the provided rubber adjustments for a snug fit if necessary.
- Slide the speaker into the cycling mount until it clicks securely into place.
- Ensure the speaker is firmly attached before riding.

5. Operating Instructions
5.1 Power On/Off
- To Power On: Press and hold the Play/Pause/Power button for approximately 3 seconds until the indicator light illuminates.
- To Power Off: Press and hold the Play/Pause/Power button for approximately 3 seconds until the indicator light turns off.
5.2 Bluetooth Pairing
- Ensure the speaker is powered on and in Bluetooth pairing mode (indicator light will flash).
- On your mobile device, enable Bluetooth and search for available devices.
- Select "Onforu SK03" from the list of devices.
- Once paired, the indicator light will stop flashing and remain solid.

5.3 Audio Playback
- Play/Pause: Short press the Play/Pause/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.
5.4 AUX Input
For devices without Bluetooth, use the provided audio cable.
- Connect one end of the audio cable to the AUX port on the speaker.
- Connect the other end to the audio output of your device (e.g., MP3 player, laptop).
- The speaker will automatically switch to AUX mode.

6. Key Features
- IP65 Waterproof Rating: Designed to withstand water splashes and dust, making it suitable for outdoor use in various weather conditions, including rain, beach, pool, and shower environments.
- Bluetooth 5.0: Provides a stable and continuous wireless connection for seamless audio streaming.
- Up to 10 Hours Playtime: Enjoy extended music playback on a single charge (at 60% volume).
- 5W Loud Volume: Delivers clear and powerful sound for an immersive listening experience outdoors or indoors.
- Portable & Compact Design: Measuring just 3.24 inches and weighing 163 grams, it is easy to carry anywhere, with an included metal hook for added portability.
- Designed for Cycling: Features an adjustable bike holder and thick gasket for secure mounting on bicycle handlebars, ensuring stability on bumpy roads.




7. Maintenance
- Cleaning: Wipe the speaker with a soft, damp cloth. Do not use harsh chemicals or abrasive cleaners.
- 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 in regular use. Avoid fully discharging the battery frequently.
- Water Exposure: While IP65 waterproof, avoid prolonged submersion in water. Ensure the charging port cover is securely closed before exposure to water.
8. Troubleshooting
- Speaker does not power on.
- Ensure the battery is charged. Connect the speaker to a power source using the USB cable and try again.
- Cannot pair with Bluetooth device.
- Make sure the speaker is in pairing mode (indicator light flashing). Ensure Bluetooth is enabled on your device and it is within 10 meters of the speaker. Try restarting both the speaker and your device.
- No sound during playback.
- Check the volume levels on both the speaker and your connected device. Ensure the speaker is correctly paired via Bluetooth or connected via AUX cable. If using AUX, verify the cable is fully inserted.
- Poor sound quality or distortion.
- Move the speaker closer to your Bluetooth device to reduce interference. Ensure there are no obstructions between the speaker and the device. Check if the audio source itself has good quality.
9. Specifications
| Feature | Specification |
|---|---|
| Model Name | Onforu SK03 |
| Brand | Onforu |
| Connectivity Technology | Bluetooth |
| Wireless Communication Technology | Bluetooth 5.0 |
| Speaker Maximum Output Power | 5 Watts |
| Audio Output Mode | Stereo |
| Water Resistance Level | IP65 Waterproof |
| Maximum Range | 10 Meters |
| Power Source | Battery Powered (1 Lithium Ion battery required) |
| Charging Time | Approximately 10 Hours (for full playtime) |
| Item Weight | 163 Grams (5.7 ounces) |
| Product Dimensions | 3.24"D x 3.24"W x 3.07"H |
| Material | Silicone |
| Control Method | Touch Buttons |
| UPC | 713721189274 |


10. Warranty and Support
The Onforu SK03 Portable Bluetooth Speaker comes with a Limited Warranty. For specific warranty terms and conditions, please refer to the documentation included with your purchase or contact customer support.
For technical support, product inquiries, or warranty claims, please contact Onforu customer service:
- Email: support@onforuleds.com
- Website: www.onforuleds.com






