RE Audio REH-2 High Quality Foldable Adjustable 2 Channel (Dual Channel) Infrared IR Wireless Headphones with Volume Control and On/Off Button Lightweight Headrest for wearing comfort Auto mute function Carrier Frequency: R-CH(2.8 Mhz) , L-CH(2.3 MHz) Operates up to 48 hours on (2) AAA batteries * not included Frequency Response: 30-20 KHz