CB288 Beltpack Transmitter for the Concert 288 system. It provides a locking Mini-XLR microphone input, a power/mute switch, and operates on two AA alkaline batteries for up to eight hours. RF power is 10 mW EIRP with an approximate 300 ft operating range. Dimensions are 96 mm × 62 mm × 18.5 mm and weight 93 g. Channel A/B variants (Band H/I) are available for different bands.