1.Built-in 32G SD memory card: there are more than 2600 music stored in the bone conduction headphones.2. 2. IPX8 bone conduction headset works well in the shower or swimming pool.3. The headset is suitable for Bluetooth smartphone or tablet.4. IPX8 level professional waterproof non-sensitive wearing comfortable and passionate.5. Beyond the bright, round chamfered design, sports more pressure-free feeling.Battery: 180mAhWireless working range: 10 metersWaterproof performance: IPX8Caution1. The first time you use the headset, the battery must be fully charged.2. Do not swim for more than 30 minutes each time3. If not used for a long time, please charge at least once a month.4. 4. After each exercise, to clean up the surface of the headset in time, especially the charging position of the magnetic, and timely cleaning to prevent sweat and salt water corrosion loading port, affecting the life of the product.5. Please use the output power of 5V1A or less charging head.