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 MicrophoneThe hidden omni-directional microphone automatically picks up your voice with remarkable clarity. Built-in rechargeable lithium batteryRecharge by using the universal mini-USB cable—even while you’re still playing; 2-hour charging,6-hour enjoyment. System Requirements PC: -Windows® or Mac OS® computer -With USB port or 3.5mm audio output Other audio sources: -With 3.5mm audio output Size: 155mm * 166mm * 60mm