The set includes the DSR800 reference two-channel digital wireless receiver  a pair of DPT800 body pack transmitters  and two C111 LP ear hook microphones The DSR800 receiver provides an ultra-wide bandwidth of up to 150MHz for reliable and versatile operation  while the DPT800 body pack transmitters offer selectable radio output power of 10 – 50mW and the convenience of remote programming via infrared data transmission from the DSR800