M-1 Back-mounted Touch Noise Reduction Bone Conduction Bluetooth Earphone with Detachable Microphone Features: 1. Bluetooth 5.0 2. Bone conduction to avoid hearing loss 3. Double microphone noise reduction, clear call 4. The microphone is detachable, and the charging socket is common to the microphone socket 5. Touch buttons, one-handed operation, support previous songnext song, adjust volume, call voice assistant and other functions 6. The titanium alloy back hangs the line, wears it firmly and does not fall 7. IPX5 waterproof Product specifications: 1. Headphone weight: 25g 2. Bluetooth version: V5.0 3. Battery capacity: 150mAh 4. Speaker type: bone conduction vibrator speaker 5. Battery life: 6-8 hours (the actual duration is related to the volume) 6. Bluetooth distance: about 10m 7. Charging time: about 2 hours 8. Bluetooth protocol: A20PAVRCPHSPHFP Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.