The Pyle PHPW2 Wireless Headphones provide Clear, Bright, and Full sound without the hassle and tangle of wires to get in your way. They feature a Powerful wireless transmitter, which can be connected to anything with Audio output, such as your Television, Stereo, Computer, MP3 player, etc. With over 100 Feet of range, feel free to roam with these Pyle wireless headphones. Wireless Reception from TV Wired Reception to Mp3 Player FM Radio and Wired Reception from PC, CD, DVD Players Reception Frequency Range: 85MHz~108MHz Driver Size: 40mm Sensitivity (S.P.L): 105dB±3dB/MW (at 1 KHz) Impedance: 32 Ohms ± 15% Frequency Response: 20~20,000Hz Signal/Noise Ratio: >50dB Headphone: DC 3V (2x1.5V AAA batteries) Transmitter: DC 3V (2x1.5V AAA batteries) Maximum operation distance: 100FT, 360° Sold as : Unit