Sanwa Supply loudspeaker speaker head microphone 1m MM-SPAMP2 Hands-free MM-SPHM2

[Model]:Unidirectional electret condenser type [Frequency characteristics]: 80Hz~12KHz [Sensitivity]: -45dB (0dB=1V/Pa, 1KHz) [Operating voltage]: 1.5V~3V [S/N ratio]: 55dB or more [Current consumption]: 0.5mA or less (supply voltage 3V) [Impedance]: 2.2KΩ(1KHz) [Head microphone weight]: Approx. 35g [Length]: Approximately 1m