Brand N/A Model IR-2011D Colors Black + silver Quantity 1 Type Wireless Channels 5.1 Power Supply 2 x AAA (not included) Interface 3.5mm headset jack Material Plastic Total Power >8mW Impedance 27.8~36.8ohm Signal to Noise Ratio(SNR) >56dB Sensitivity >-70dB Other Features Suitable for car audio system; Up to 12 meters operating distance; Automatic shut-off after 10 minutes of no signal detection; Ultra light design for comfortable wearing; Mini jack for audio input like MP3 player iPod; Built-in 30mm Mylar speaker to deliver audiophile grade sound quality; System infrared light: 850nm; Carrier frequency: A channel: left channel: 2.3 MHz Right channel: 2.8 MHz / B channel: left channel: 3.2 MHz Right channel: 3.8 MHz; Signal to Noise: >60 dB; Channel Separation: >45 dB; Distortion: Packing List 1 x Headphones