The WH-288 UHF is a dual handheld wireless microphone from EZITECH which has the dynamic mic core and the frequency response that up to 40Hz to 15kHz. Its pattern is undirectional and its sensitivity is -54+-3dB with 600ohm +-30%. It has positive pressure on the diaphragm results in a positive voltage at pin 2 in relation to pin 3 and using a 3P XLR (M) as output connector.