1. Introduction
Thank you for choosing the Sanag B33S Bone Conduction Headphones. These headphones are designed to provide a unique audio experience, transmitting sound through your cheekbones, allowing your ears to remain open to ambient sounds. Featuring IPX8 waterproofing, 32GB of built-in MP3 storage, and Bluetooth 6.0 connectivity, the B33S is ideal for various activities including swimming, running, cycling, and general sports. This manual provides essential information on how to set up, operate, and maintain your headphones.
2. Package Contents
Ensure all items are present in your package:
- Sanag B33S Bone Conduction Headphones
- Charging Cable
- User Manual
3. Product Overview
The Sanag B33S headphones feature a lightweight, open-ear design for comfort and situational awareness. Key components include the bone conduction transducers, control buttons, and charging port.

Image: Sanag B33S Bone Conduction Headphones, showcasing the overall design and Sanag branding.
4. Setup
4.1 Charging the Headphones
Before first use, fully charge your headphones. A full charge takes approximately 2 hours.
- Connect the charging cable to the charging port on the headphones.
- Connect the other end of the cable to a USB power adapter (not included) or a computer's USB port.
- The indicator light will show charging status and turn off when fully charged.

Image: Close-up of the headphone's internal display showing battery life and charging status.
4.2 Power On/Off
- Power On: Press and hold the Power button until the indicator light flashes.
- Power Off: Press and hold the Power button until the indicator light turns off.
4.3 Bluetooth Pairing
The B33S uses Bluetooth 6.0 for fast and stable connections up to 50 feet.
- Ensure the headphones are powered off.
- Press and hold the Power button for approximately 5-7 seconds until the indicator light flashes red and blue alternately, indicating pairing mode.
- On your device (smartphone, tablet, etc.), enable Bluetooth and search for "Sanag B33S".
- Select "Sanag B33S" to connect. A voice prompt will confirm successful pairing.
4.4 MP3 Mode
The headphones feature 32GB of built-in memory for MP3 playback, allowing you to listen to music without a connected device. This mode is essential for underwater use as Bluetooth signals do not transmit effectively underwater.
- Transferring Music: Connect the headphones to a computer using the charging cable. The headphones will appear as a removable disk. Drag and drop your MP3 audio files into the headphone's storage.
- Switching to MP3 Mode: While the headphones are on, press the Mode button (refer to product diagram for location) to switch between Bluetooth and MP3 modes.

Image: Graphic illustrating the 32GB internal memory for storing music.
5. Operating Instructions
5.1 Music Playback
- Play/Pause: Press the Multi-function button once.
- Next Track: Press and hold the Volume Up button.
- Previous Track: Press and hold the Volume Down button.
- Volume Up: Short press the Volume Up button.
- Volume Down: Short press the Volume Down button.
5.2 Call Management
The built-in HD microphone with ENC (Environmental Noise Cancellation) allows for clear calls.
- Answer/End Call: Press the Multi-function button once.
- Reject Call: Press and hold the Multi-function button for 2 seconds.
- Voice Assistant: Double-press the Multi-function button.
5.3 Swimming Mode
For swimming, ensure the headphones are in MP3 mode. Bluetooth signals are not effective underwater.

Image: A person swimming while wearing the Sanag B33S headphones, demonstrating their waterproof capability.
Video: Official Sanag B33S IPX8 Swimming Bone Conduction Headphone demonstration, highlighting its waterproof features and use during swimming.
6. Key Features
- IPX8 Waterproof Rating: Professional IPX8 protection allows full submersion up to 2 meters, making them suitable for swimming and water sports.
- Bone Conduction Technology: Delivers audio through bone vibrations, keeping your ears open to ambient sounds for enhanced safety during outdoor activities. Features enhanced low-frequency vibration for clear sound, even underwater.
- HD Call Noise Reduction: Built-in high-definition microphone with ENC technology filters environmental noise for clear calls in various environments.
- Bluetooth 6.0 & 32GB MP3 Storage: Latest Bluetooth 6.0 chip for fast pairing and stable connections. Integrated 32GB memory stores thousands of songs for phone-free listening, especially crucial for swimming.
- 40 Hours Total Playtime: Offers 8 hours of continuous playback on a single 2-hour charge, with the charging case providing an additional 32 hours.
- Lightweight & Comfortable Design: Weighing only 4.5g per earbud, the golden triangle earwing design ensures a secure and comfortable fit for extended wear, compatible with glasses.

Image: Graphic illustrating the bone conduction panoramic sound technology, showing sound waves transmitting through bone.

Image: A person wearing the Sanag B33S headphones, highlighting the stable and comfortable fit for active use.
7. Maintenance
Proper care ensures the longevity of your Sanag B33S headphones:
- After swimming or heavy sweating, rinse the headphones with fresh water and dry thoroughly with a soft cloth.
- Do not use abrasive cleaners or solvents.
- Store in a cool, dry place away from direct sunlight and extreme temperatures.
- Avoid dropping or subjecting the headphones to strong impacts.
8. Troubleshooting
| Problem | Solution |
|---|---|
| Headphones won't power on | Ensure the headphones are fully charged. |
| Cannot pair via Bluetooth | Ensure headphones are in pairing mode (flashing red/blue). Turn off and on Bluetooth on your device. Move closer to the device. |
| No sound in MP3 mode | Ensure audio files are in a compatible format (MP3). Check if volume is turned up. |
| Poor sound quality underwater | Ensure headphones are in MP3 mode. Bluetooth does not work underwater. |
| Microphone not clear | Ensure microphone is not obstructed. Speak clearly and directly towards the microphone. |
9. Specifications
| Feature | Detail |
|---|---|
| Brand | Sanag |
| Model Name | B33S |
| Connectivity Technology | Wireless (Bluetooth) |
| Bluetooth Version | 6.0 |
| Water Resistance Level | IPX8 Waterproof |
| Built-in Memory | 32GB (MP3) |
| Battery Average Life | 8 Hours (continuous playtime) |
| Battery Charge Time | 2 Hours |
| Item Weight | 21 Grams |
| Ear Placement | Open Ear |
| Audio Driver Type | Bone Conduction Driver |
| Frequency Range | 20 Hz - 20 KHz |
| Impedance | 8 Ohms |
| Sensitivity | 81 dB |
| Control Type | Button Control |
| Material | Plastic |
10. Warranty & Support
The Sanag B33S Bone Conduction Headphones come with a 1-year warranty from the date of purchase. This warranty covers manufacturing defects and workmanship under normal use.
For technical support, warranty claims, or further assistance, please contact Sanag customer service through the retailer where you purchased the product or visit the official Sanag website for contact information.







