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This is a great product for smaller shops, stores, and warehouses, who want an instant chime sound to play when someone walks through a door or other monitored area. When you want a simple alert that is easy to install and maintain, this is a great product to use. The SL-40 is a reliable, do-it-yourself entrance alert chime you can install in seconds. The sensor is passive-infrared based motion detector you place over a door or other area you wish to monitor, and when the combination of heat and movement are detected, it plays either a "DING" or "DING-DONG" tone (you choose). With this product, the sound emanates from the sensor and does not send the sound to a remote location. PLEASE NOTE: this entrance alert chime is a wireless, one (1) piece entrance alert unit that detects motion AND plays the sound from the sensor. This unit works by itself and is not a piece of a different kit and is not compatible with other devices. Features Volume control knob allows you to adjust volume Plays one of two tones you select, DING or DING-DING Sensitivity setting allows you to increase/decrease detection range Easy to mount - mounting hardware included Included mounting bracket allows you to adjust angle to tweak monitored zone Ideal for locations up to 1,500 SQFT Powered by 9-volt alkaline battery 1-year manufacturer's warranty PLEASE NOTE: this entrance alert chime is a wireless, one (1) piece entrance alert unit that detects motion AND plays the sound from the sensor. This unit works by itself and is not a piece of a different kit and is not compatible with other devices.