Sennheiser MKE 2-EW Gold. Microphone sensitivity: 3 dB, Microphone frequency: 20 - 20000 Hz, Microphone direction type: Omni. Connectivity technology: Wired, Connector(s): 3.5 mm, Cable length: 1.6 m. Current consumption: 250 mA, Operating voltage: 7.5 V