Sennheiser EW 135P G4 A1-Band, UHF Wireless camera-mount system, Consists of a SKM 100 G4 handheld transmitter, dynamic E835 changeable capsule, and an EK 100 G4 pocket receiver, Frequency range: A1-band (470 - 516 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 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