Specifications:Bluetooth version: V2.1+EDRBluetooth protocol: Hsp/Hfp/A2dp/AvrcpOutput power: Class IIOperation distance: 10mRange of frequency: 2.4 to 2.4835GHZCharging time: Approx.2.5hoursPlug type: 3.5mm stereoColor: Red/Gold/White/GreenAudio cable length: Approx. 1.1m / 3.61ftEarmuff diameter: 8cm / 3.1inItem weight: 195g / 6.9ozPackage size: 20 * 19.5 * 9cm / 7.9 * 7.7 * 3.5inPackage weight: 351g / 12.4ozPackage content:1 x Headset1 x USB cable1 x Audio cable1 x User manual