The circuit employs the functions of reed switches to produce a gate alarm that is powered by a universal AC/DC power supply. The circuit employs the functions of reed switches to produce a gate alarm ...

Commuters trying to escape a crowded subway exit bottleneck have come to accept those abominable emergency door alarms as an infuriating fact of life. But the New York City Transit Riders Council says ...

With a visually appealing and functional design, SDC door prop alarms are compatible with all access control systems but can also function as a stand-alone solution. Now you can condition access ...

The Kouba Systems Outdoor Rated Local Door Alarm is designed for outdoor locations where access control and monitoring is required on gates or doors. It may be mounted directly to a wall or to a fence ...

We are in a digital era! Now we can add some intelligence to our doors and gates without too much investments. Just assemble this little door timer circuit built around a few cheap and simple ...