4-in-1 headphones: 1) Wireless headphone 2) FM radio receiver 3) Wired headphone 4) Online chat wired headsetWired headphones instruction: (using PC cable) 1) Wired headphone use: plug single head into headphone jack and the black plug into earphone jack of TV/PC/audio player/laptop 2) Online chat on PC: plug single head into headphone jack and red plug into Mic jack of PC/laptop and black plug into earphone jack of PC/laptop Features:1) Transmitter transmits stereo signal in 86MHz to wireless headphones2) Super strong signal, the receiving range is up to 90 feet interference-free3) Multi-direction receiving; can receive signal blocked by the door or wall4) Using the headphones alone it becomes a FM radio receiver ranging between 83.5 and 108MHz (auto-scan)5) Connect headphones to PC/laptop with enclosed PC cable with Mic input line for online chatting6) Power on/off switch on transmitter and headphones to save battery life when not in use Specifications:1) Transmission frequency: 86MHz 2) Maximum transmission distance: 90 feet3) FM radio frequency: 83.5 - 108MHz 4) SNR: > 35dB 5) Sensitivity: > 22糣 6) Maximum output power: 0.5W 7) Operates on 4 "AAA" batteries (not included). 2 for headphones and 2 for transmitter Package contents:1) Wireless headphones with built-in FM tuner, antenna and volume control 2) Transmitter 3) User manual 4) RCA stereo cable 5) PC cable with built-in Mic, 5 feet long, 2 connectors (Mic in red and earphone in black)Exclusive review: The headphones are comfortable and lightweight. The set up is straight forward and with 4 "AAA" batteries, you will start to use it in minutes. The channel is easy to find; just press the "reset" button first and then press the "scan" button to search the frequency. Usually you just need to press it once. The signal is multi-directional, you can still hear it even in another room and the sound quality is still good. According to my experience for better sound quality, raise the volume at the source, like the TV sound and lower the volume on the headphone. One of the features I like is that multiple headphones can receive signals from the same transmitter, so two or more people can share the same audio source in the house. Overall, these headphones are a handy wireless toy for your home entertainment. producing area:China