Specifications:Bluetooth version: V5.1+EDRWireless frequency: 2.4GHZSupported protocols: A2DP1.3/HFP1.6/HSP1.2/AVRCP1.6/D11.3Transmission distance: 10 metersBattery capacity: 180mAhCharging voltage/current: 5V/1APlay/talk time: about 16 hoursCharging time: about 2 hoursStandby time: 300 hoursSpeaker impedance: φ8mm 32ΩMicrophone sensitivity: -42DbWorking temperature: -10-50℃Full set weight: 102gFeatures:1. safe to exercise, and can hear external sounds at any time2. 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 time3.18 hours of strong endurance, 120 days of super long standby, go to sports at will, and keep music4. Life class waterproof, no fear of wind, rain and cold to prevent damage to the device by sweat and rain5. Low power consumption 5.2 chip, strong signal, one second connection, more stable listening and talking.Package Included:1*Headphone1*Charging cable1*User Manual 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. Sold by-YJL official store