SL-40 is a self-contained door announcer model which is the easiest unit to install. The a pleasant sounding chime alerts when customers walk past the passive infrared eye. Easy to install. Features: Powered by 9 Volt Battery Long battery life circuit design Fully automatic, no alignment required. Ceiling, above door, or side mounting. No wires, easy installation Welcomes with a pleasant sounding chime Prevents unannounced entry Helps control theft One year warranty Low cost
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