LD Systems U308 BPW, UHF Radio system with body-pack and microphone for wind instruments, Radio frequency band: 823 - 832 MHz and 863 - 865 MHz, 12 Selectable channels, Up to 6 systems can be used simultaneously, Transmission power: 10 mW, ASC infrared synchronization of transmitter and receiver, Squelch with pilot tone, 10 h Transmitter run-time with two AA batteries, Receiver in sturdy metal housing, Suitable rack mounting kits: Article Nr. #452686# and Article Nr. #407645# (both not included)