Shure P3RA PSM 300 H20, UHF InEar Receiver, Frequency range: H20 (518-542 MHz), Black metal housing, Output: 3.5 mm stereo jack, Stereo, Mono and MixMode function, MixMode (create your own mix of two mono signals), Very wide stereo separation, Powered by 2x AA batteries up to 5.5 h or with optional SB900 battery up to 7 h, Weight: 415 g