The Sennheiser SK 300 G4-RC is a bodypack wireless transmitter compatible with the EM 300-500 G4 receiver. The rugged, all-metal design is comfortable for performers and presenters to wear for daily use on stage. The transmitter operates on an exceptionally wide 88 MHz UHF tuning range with 3520 selectable frequencies available. It provides up to 8 hours of operation on two AA batteries, with a transmission range up to 330 feet and a selectable 10/30/50mW RF power output for overcoming interference in difficult RF environments.