LD Systems U304.7 BP Body Pack Transmitter (470-490 MHz)Operating in the 470 490 MHz band, this U300 Series bodypack transmitter features a miniature XLR input with 3 position level selector to accommodate microphones as well as active and passive instrument pickups. It has an output power of 10 mW and 25 Hz 16 KHz frequency response to handle 5 string bass guitars with a low B string. The U3047 BP provides over 10 hours of continuous operation on two AA batteries, easy IR syncing with the U3047 receiver