Loud indoor/ outdoor telephone ringer for standard (POTS) land-lines. Plugs into a telephone jack or can be hard-wired for outdoor use (no power supply required). Its intense 110dBA warbling tone reaches every corner of an industrial location or home. Three loudness settings allow tailoring to the environment. Compact metal housing is just over 5" square, weighing 20 ounces. Preferred by professionals for 25 years.
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