Shure P9RA+ PSM 900 L6E, In-ear Receiver, Frequency range: L6E (656-692 MHz), CueMode to control up to 20 different in ear mixes directly at the receiver, Audio Reference Companding for powerful and clear InEar Sound, Solid metal housing, Audio frequency range: 38 - 15,000 Hz, 20 Compatible frequencies per band, 3.5 mm jack for earphones, Display with frequency indicator, RF level and battery status indicator, Charging contacts for battery, Powered by 2 AA batteries or SB900 Li-Ion batteries, Dimensions (H x W x D): 99 x 66 x 23 mm, Weight (without batteries): 154 g