Pyle PLVWH2 Dual A/B Channel Infrared Wireless Stereo Headphone Dual Channel Allows you to listen without interfering with other channels Studio Quality Headsets with Wide Angle Infrared Detection High Quality Drivers for Excelent frequency response Operational Distance: 100FT Selectable Program Source Inputs Adjustable Headphone Straps for Comfort Auto Mute Control Variable Volume Control MP3 Player Input Via 3.5mm Jack COmpatible with All In-Vehicle AV Application On/Off Switch saves battery life Channel (A) 2.8 MHZ (Right) 2.3 MHz (left) Channel (B) 3.8 MHZ (Right) 3.2 MHZ (Left) Power Source: Transmitter DC 12VDC Hardwired 2 AAA Batteries 1.5V for each headset (not included) Current: Impedance: 10K OHM  15 % Auto on Lever: Less than 30MA (Input: 1 KHz) Auto off Time: 120 Sec - 240 Sec Sold as : Unit Dual Channel Allows you to listen without interfering with other channels - Studio Quality Headsets with Wide Angle Infrared Detection Operational Distance: 100FT - Selectable Program Source Inputs - Adjustable Headphone Straps for Comfort - Auto Mute Control MP3 Player Input Via 3.5mm Jack - Compatible with All In-Vehicle AV Aplication - On/Off Switch saves battery life Channel (B) 3.8 MHZ (Right) 3.2 MHZ (Left) - Power Source: Transmitter DC 12VDC Hardwired - 2 AAA Batteries 1.5V for each headset Current: &lt;80mA - Impedance: 10K OHM  15 % - Auto on Lever: Less than 30MA (Input: 1 KHz) - Auto off Time: 120 Sec - 240 Sec