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Features: 1. Drive: 15mm 2. Impedance: 32 ohms 3. Bluetooth version: Bluetooth V5.2 + EDR, ultra-low power consumption 4. Bluetooth band: 2.4 GHz 5. Energy level: level II6 6. Output power: 30MW 7. Bluetooth distance: 12m barrier 8 frequency response: 20-20000hz 9. Voltage range: 3.0v4.2v 10. Microphone sensitivity: - 42db 11. Using a2dp1.3/avrcp1.6/d 11.3/hsp1.2 high quality stereo audio transmission and remote control protocol 12. Strong noise reduction circuit (active noise reduction) 13. Talk time is about 4-5hours, music time is about 4-5 hours 14. Standby time is about 60 hours. Caution: do not treat the product violently, squeeze it, keep away from high temperature and humidity, high frequency transmitting equipment, use it within 13m of effective environment, refuse to block (wall partition) waterproof and sweat proof design package includes: 2 × Mini Bluetooth headset (left and right earphones) 1 × charging box 1 × USB charging cable 1 × spare earphone 1x spare silica gel plug