For intercom and P.A., this is designed especially for mounting to wall outlet boxes. The WM625S has a simple push-to-operate DPDT snap-action switch. Specifications:Operating Principal Moving Coil DynamicPolar Pattern OmnidirectionalFrequency Response 300Hz – 4KHzSensitivity -42dBV (7.9 mV) @ 1 Pa / -38dBVImpedance 500 ohms / 2500 ohms
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