The Galaxy Audio AS-950R is an easy to operate wireless In-Ear Monitor Bodypack Receiver in the P2 Band 470-494 MHz requency range that works with the AS-950T P2 Transmitter (items sold separately). . It can be used as an additional or replacement receiver. This lightweight (3.35 Ounce), agile, 16-channel receiver has a built-in limiter, LCD channel display and up/down channel selection. It's powered by 2 Alkaline or Rechargeable AA batteries (sold separately) providing about 12 hours of runtime when using alkaline and approximately 5 hours using rechargeable. The AS-950R also features two 50mW Earphone outputs with volume control and a includes pair of EB4 earbuds with titanium drivers with a frequency response of 20Hz-20KHz for incredibly accurate monitoring! The Galaxy Audio EB4 ear buds also feature extended bass response and aluminum alloy construction.