Sennheiser EW 135P G4 B-Band, UHF Wireless camera-mount system, Consists of a SKM 100 G4 handheld transmitter, a dynamic E835 removable capsule, and an EK 100 G4 pocket receiver, Frequency range: B-Band (626-668 MHz), Directional characteristic: cardioid, 42 MHz Switching bandwidth, 20 Channel banks with up to 12 presets each, Up to 20 compatible channels, Audio transmission range: 25 - 18,000 Hz, Frequency transmission via infrared interface, Handheld transmitter and pocket receiver with charging terminal for an optional BA 2015 (NiMH) battery (not included, must be ordered separately), Pilot tone, Automatic frequency scan feature locates available frequencies, Audio gain: 60 dB, 4-Digit battery indicator on the transmitter and receiver, HDX compander, LCD display with AF / RF level and channel display, Transmission power: 30 mW, Includes a CL100 cable, CL 1 cable, and a CA 2 flash unit adapter