The SENNHEISER's EW100 G4 Ci1 is a rackmount wireless microphone system that provides guitar and bass players with consistent high-quality wireless sound in small to medium-sized venues such as concert stages, houses of worship, theatres, and clubs. A genuine diversity half-rack receiver is contained in a sturdy, full-metal chassis in the EW 100 G4-Ci1. The receiver's auto-scan function looks for a clean, interference-free channel for your audio transmission across a wide 42 MHz UHF tuning range with 1680 selectable frequencies. For guitarists, the inbuilt guitar tuner is a welcome addition. A Ci 1 cable links your instrument to the lightweight bodypack transmitter in this system. With a set 30mW RF power output and a transmission range of up to 330', the transmitter can run for up to 8 hours on two AA batteries. In the same space, up to 12 wireless channels can operate simultaneously, with receivers linked together for quick multi-channel frequency configuration.