Hama RMV-01 Universal Directional Microphone. Microphone sensitivity: 68 dB, Microphone frequency: 150 - 15000 Hz, Microphone operation mode: Cardioid. Connectivity technology: Wired, Connector(s): 3.5mm male, Cable length: 7.5 m. Battery type: Mignon AA, Operating voltage: 1.5 V