A headset includes a substantially U-shaped frame, two speakers mounted at two ends of the substantially U-shaped frame, an infrared emitter, and an infrared receiver facing the infrared emitter. The infrared emitter is configured for emitting infrared light towards the infrared receiver. The infrared receiver is configured for receiving the infrared light from the infrared emitter and for generating a pause signal after the infrared light is continuously received by the infrared emitter for a first predetermined time. The headset is configured to stop working according to the pause signal.