Wireless Type: RF Operating Time: Up to 6-hour Distance: 33 feet Headphone Frequency Response: 20Hz–20KHz Weight: 3 oz. Microphone Sensitivity: -42 dB Features: Wired/Wireless dual Working Mode The device can works in wired mode by connect the audio-USB cable when you run out of battery. you will never interrupted by empty battery. Built-in Microphone The hidden omni-directional microphone automatically picks up your voice with remarkable clarity. Built-in rechargeable lithium battery Recharge by using the universal mini-USB cable—even while you're still playing; 2-hour charging,6-hour enjoyment. Package Contents: H3050 Wireless Headset Blue USB NANO Receiver Quick start guide USB Cable 3.5mm to USB audio cable