Features • Approved for indoor and outdoor use • Low current draw • High dB output • Available in six-inch, eight-inch, and ten-inch sizes • AC and DC models • DC models polarized for use with supervision circuitry • Mount directly to standard four-inch square electrical box indoors • SSM and SSV series come pre-wired Reliable Performance. The SSM and SSV series provide loud resonant tones. The SSM series operates on 24VDC and are motor driven, while the SSV series operates on 120VAC utilizing a vibrating mechanism. Simplified Installation. For indoor use, the SSM and SSV series mount to a standard four-inch square electrical box. For outdoor applications, weatherproof back box, model number WBB, is used. The SSM and SSV series come pre-wired, to reduce installation time. The SSM series incorporates a polarized electrical design for use with supervision circuitry.