The SM1-SS-MS from ETS is a high performance, omni-directional, pre-amplified microphone for fixed location security applications. 25’ pickup pattern in all directions. Built in limiter circuit automatically lowers the output level during loud sound intervals. Hi cut and low cut filters significantly reduce background noise. Built in mute switch turns audio output off) with LED indicator. LED lights red when muted and Green when not. Stainless steel plate mounts flush or on a single gang electrical box. Connects directly to our switcher / mixer / amplifiers or use one of our many interface products to make fast and clean connections to DVRs or remote monitoring equipment.