Perfect Compatible with iOS and Andriod System/comfortable to Wear/High FidelityProduct SpecificationsBluetooth HeadsetEarphone Model: RB-T16transmit power: class 2(-6dbm4dbm)working frequency band: ism bandCharging voltage: SvWorking voltage: 3.7vWeight about 139Impedance:16215Xsensitivity:110:3dBF..