Shure P3RA PSM 300 T11, UHF InEar Receiver, Frequency range: T11 (863-865 MHz), Black metal housing, 3.5 mm stereo jack output, Personal mix control, Very wide stereo separation, MixMode function, Powered by 2x AA batteries up to 5.5 h or with optional SB900 battery up to 7 h, Weight: 415 g