5-in-1 wireless headphone & wired headset for laptop PC / TV computer gaming / sports FM radio / DVD / CD MP3 / audio chat / monitoring earphone 1) Wireless headsets for computers and laptops 2) Audio chat: built-in microphone enables you to talk via online messengers like Skype and MSN, it's perfect audio-chat tool, provides infinite enjoyment, 3) FM radio: the headset can be used as FM radio separately, search and lock channels automatically 4) Wired earphone: Built-in 3.5mm earphone jack enables you to connect to other devices with earphone cable like working as a wired headphone, equipped with audio cable ,the receiver can be used as a wired earphone, 5) Wireless monitoring: place the emitter near baby, senior people, or patients who need care, and the sound of the cared people can be heard with the receiver for easy care Receiver technical specifications: frequency range: 86 - 108 MHz, Reception mode: FM, distortion: =&lt;2%, Power supply: 2 x AAA batteries ( not included ) Transmitter technical specifications: Transmitter frequency: 86 +- 0.5MHz, Modulation mode: FM, Transmitter distance: &gt;= 8m, Reception from any audio and visual equipment with audio out socket, such as TV set, audio device, DVD/VCD player, multimedia PC, etc, Power supply: 2 x AAA batteries or 4.5 DC ( not included ) Package including: 1 x wireless headphone, 1 x FM transmitter ( stand ), 1 x user's manual, 1 x audio cable