LD Systems U508 IEM HP, In-Ear Monitoring System, Set includes a LDU508IEMT transmitter, a LDU508IEMR receiver, and a LDIEHP2 in-ear headphones, Frequency range: 823-832 and 868-865 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 a 19"" rackmount kit, BNC antenna, power adapter, 3 pairs of foam eartips, 3 pairs of silicone eartips and a transport case