UHF Wireless Stereo Headphone With Wireless iPod Dock Transmitter And RF Remote Control - Remote Can Be Used Threw Walls - Active Noise Reduction System For Crystal Clear Sound - Distortion: 1%(Maximum) * Universal iPod Dock Plays And Charges All Docking iPod Models - Several Headphones Can Be Used Simultaneously With One Ipod Transmitter - System: UHF - Frequency Response: 30 - 20,000Hz * Auxiliary Connection Lets You Listen To Non-Docking iPod Models, - Working Distance Up To 150 Feet With Our Latest RF Wireless Technology - Carrier Frequency: 915mhz - Power Supply Of Transmitter: DC12V 150ma * TV/CD/DVD/MP3 Or Any Audio System - Auto Mute And Auto Running Function Available For Headphones - S/N Ratio: 75db(Minimum) - Power Supply Of Headphone: 2 AAA Batteries * Remote Offers Many Buttons For Easy Control And More From Across The Room. - Double PLL System For Ultimate Frequency Stability - Channel Separation: 35db(Minimum) - Power Supply Of Remote Control: Button Batter