Shure PSM 300 Premium, UHF InEar Wireless-System comprising P3T InEar transmitter and P3RA Metal InEar receiver, stereo transmitter with 24-bit Audio, Audio Reference Companding, extra wide stereo image, MixMode-Function, Infrared tranmitted informations from transmitter to the receiver, 9,5" houding, 2x jack in, 2x jack out, removeable BNC antenna, stereo pocket receiver with Personal Mix Control, works with 2x AA Batteries up to 5,5h or with optional SB900 rechargeable battery up to 7h, 38 - 15.000 Hz, 20 mW transmitted power, frequency range S8 823 - 832 Mhz, incl. rackkit