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Both models have a self-contained, rugged, low impedance dynamic cartridge assembly. The WM-625S has a simple push-to-operate DPDT snap-action switch suitable for almost all switching requirements. APPLICATIONS The Models WM-625 and WM-625S are excellent choices for intercom and P.A. applications in warehouses, factories, schools, restaurants and fast food outlets, apartment houses, security detection, etc. ARCHITECTS' AND ENGINEERS' SPECIFICATIONS The microphone shall be an Astatic WM-625,