IR-8383 Dual channel wireless ir headphonesStudio quality design Automatic Signal Detection Shut-offEffective Range: 10ft,270 AreHigh Frequency ModulationFrequency Response: 20HZ-2.3KHZImpedance: 32Ohm+/-6.4OhmSignal to noise ratio: 65dBChannelA: 2.3Mhz(left),2.8MHZ(right)ChannelB: 3.2Mhz(left),3.8MHZ(right)Distortion: 1%THD