REMAX RB‎-T13 HD is Compact‎,‎and it has light weight design‎.‎it uses bluetooth 4.1 technology‎,‎ better sound quality‎.‎Using true wireless technology‎,‎ enjoy your wireless use of high‎-capacity lithium battery and low‎-frequency balance technologyPowerful compatibility is compatible with devices as long as they are Bluetooth enabled‎.‎Three‎-step matching‎,‎ easy to use‎.‎Technical Specification ‎:‎ Model Number‎:‎ RB‎-T13Vocalism Principle‎:‎ DynamicIs wireless‎:‎ YesSensitivity‎:‎ 98±3dBImpedance‎:‎ 32±15%Rated Input Power‎:‎ 10MWSupport APP‎:‎ YesPlug Type‎:‎ WirelessFrequency Response Range‎:‎ 20‎-20000HzVolume Control‎:‎ YesWaterproof‎:‎ NoResistance‎:‎ 16ΩConnectors‎:‎ USBControl Button‎:‎ YesWith Microphone‎:‎ YesStyle‎:‎ Ear HookWireless Type‎:‎ BluetoothLine Length‎:‎ wirelessBluetooth‎:‎ 4.1Charge time‎:‎ 1hrsTime for music‎:‎ 3hrsTime for calling‎:‎ 3hrsDistance of Bluetooth‎:‎ 10m Compatibility‎:‎ Applies to Bluetooth enabled devices