Sennheiser EW 100 G4-ME4-A1. Microphone type: Lavalier microphone, Microphone transducer principle: Condenser microphone. Receiver type: Rack mount receiver, Receiver housing material: Metal, Antenna connector type: BNC. Transmitter type: Bodypack transmitter. Radio Frequency (RF) range: 470 - 516 MHz, Microphone frequency response: 50 - 18000 Hz, Operating frequency type: Ultra High Frequency (UHF). Receiver dimensions (W x D x H): 7.48 x 8.35 x 1.69"" (190 x 212 x 43 mm), Receiver weight: 34.6 oz (980 g), Transmitter dimensions (WxDxH): 2.52 x 0.945 x 3.23"" (64 x 24 x 82 mm)