Features: 5-in-1 Headset: with functions of wireless headphone, wireless net audio chatting, wireless monitoring, FM radio, and wired headphone. Wireless Headphone: wireless reception from any electrical device with audio output such as full-channel TV sound, PC, game player, CD/DVD/VCD player, audio device, and MP3 player, no more worrying about disturbing others. Wireless Net Audio Chatting: it is a perfect audio-chat tool, provides infinite enjoyment. Wireless Monitoring: place the emitter near baby, old people and sickpeople who need care, and the sound of the cared people can be heard with the receiver. FM Radio Function: the headset can be used as FM radio separately, it can automatically search for radio programs and receive FM broadcasts. Wired Headphone: equipped with audio cable, the receiver can be used as a wired headphone. Professional Wireless Headphone: features of high sensitivity, anti-interference, strong signal, outstanding performance, low power consumption and low noise. Specifications: EMITTER: Emission Frequency: 86±0.5MHz Modulation Mode: FM Emission Distance: 30M(with no interference) Power Supply: 2 * 1.5V AAA battery or 4.5V DC (both NOT included) RECEIVER(Headphone): Frequency Range: 86MHz for wireless headphone and 87-108MHz for FM radio Reception Mode: FM Distortion: ≤2% Power Supply: 2 * 1.5V AAA battery (NOT included) Material: ABS Item Weight: 292g / 10.30oz Package Weight: 360g / 12.72oz Package Size: 21.5 * 16.5 * 8.5cm / 8.46 * 6.50 * 3.35in Packing List: I8665 1 * Headset Receiver 1 * Emitter 1 * Audio Cable 1 * Manual (English)