M2 Bone Conduction Earphones Running Stereo To Ear Bluetooth Earphones 1. Material: PC+ABS 2. Battery capacity: 380mAh 3. Use time: about 8 hours 4. Charging time: about 2.5 hours 5. Frequency: 20Hz-20KHz 6. Waterproof level: IPX 5 7. Bluetooth distance: about 10 meters 8. Speaker type: bone conduction vibrator speaker 9. Bluetooth version: version 5.3 10. Bluetooth protocol: A2OP AVRCP HSP HFP 11. Headphone weight: about 31.6g Features: 1. Simple design, easy operation 2. The sound quality has been upgraded again, and the call sound quality is clearer 3. Ultra-long battery life, no disconnection during exercise 4. Noise reduction technology, effectively prevent sound leakage 5. Vibration sound generator, the sound source is transmitted to the cochlea through the bone, immersive experience 6. Bone conduction technology, using bones to transmit sound, no need to plug in the ear without hurting the eardrum, comfortable and healthy 7. The double-layer mesh structure prevents rain from raiding, and the nano-hydrophobic coating prevents sweat from penetrating Packing list: Earphone x 1 Charging cable x 1 Earplugs x 2 Manual x 1