The 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; made in the USA, and fully warranted for 1 year. This unit is not compatible with the TXRX1000A or TXRX2000A. This is a stand alone unit.
Trustpilot
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