LD Systems U508 IEM, In-Ear Monitoring System, Set includes a LDU508IEMT transmitter and a LDU508IEMR receiver, Frequency range: 823-832 and 863-865 MHz, 96 Channels to choose from, 2, 10 or 30 mW ERP selectable transmission power, More than 100 m range, Infrared synchronisation, Bodypack has a runtime of 10 h with 2x AA batteries, U500 IEM transmitter is compatible with U300 IEM bodypacks, Includes 19"" rackmount kit, BNC antenna and power adapter