LD Systems U308 BPG, UHF Radio System for Instruments, Bodypack with guitar cable, 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 Hour transmitter operation with two AA batteries, Receiver in sturdy metal housing, Suitable rack mounting kits: Article number #452686# and: Article number #407645# (neither included)