Bluetooth version: V5.1+EDR Wireless frequency: 2.4GHZ Supported protocols: A2DP1.3/HFP1.6/HSP1.2/AVRCP1.6/D11.3 Transmission distance: 10 meters Battery capacity: 180mAh Charging voltage/current: 5V/1A Play/talk time: about 16 hours Charging time: about 2 hours Standby time: 300 hours Speaker impedance: φ8mm 32Ω Microphone sensitivity: -42Db Working temperature: -10-50℃ Full set weight: 102g Specifications: 1. It is inaudible, safer to exercise, and can hear external sounds at any time 2. The air conduction does not enter the ear, which will not hurt the ear. It is safer and more comfortable to wear for a long time 3.18 hours of strong endurance, 120 days of super long standby, go to sports at will, and keep music 4. Life class waterproof, no fear of wind, rain and cold to prevent damage to the device by sweat and rain 5. Low power consumption 5.2 chip, strong signal, one second connection, more stable listening and talking. Package Included: 1*Headphone 1*Charging cable 1*User Manual