It features an OLED display with information on level, battery status (receiver and transmitter), mute and channel selection. The unit can be mounted on a standard camera shoe mount, 3/8 thread or belt-clip, and for added versatility the shoe mount can be located in one of two positions. Specifications Power source: 2 X AA Battery Or MicroUSB Antenna: Internal Output connection: 3.5mm TRS Locking Jack Socket - Dual Mono Output impedance: 300O Dimensions: 111mm X 65mm X 52mm Weight: 190gm