Product Parameters:Model: VJ087How To Use: Head-MountedBluetooth Version: Bluetooth 5.0Bluetooth Solution: Jie Li SolutionSupport Range: 2.402-2.480GHZConnection Distance: 10MSpeaker Size: 40MMImpedance: 32ohmSensitivity: 118+/-3db@1KHzFrequency Response: 20HZ-20KHZCapacity: 3.7V/400 MAUse Time: 8-10hCharging Time: 2 HoursStandby Time: 220 HoursProduct Weight: 300gPacking Box Size: 19*7.2*21 CmPacking List:Bluetooth Headset*1Charging Cable*1Audio Cable*1Manual*1