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Monitor an entrance, secure a perimeter and more with the Seco-Larm Enforcer Reflective Beam Sensor with Square Reflector, 35'. The kit creates an invisible infrared beam and alerts you when the beam is broken by sounding your alarm (sold separately). The sensor is housed in a rugged, weatherproof enclosure for long-term reliability wherever you install it. This kit can be used for a variety of applications. Use it as an alarm to protect yourself from home intruders. Mount it in front of a driveway so you know when a car pulls up. You can even use the sensor as a parking indicator in your garage to help you park in the right spot. FEATURES: Adjustable sensing distance up to 35 feet. LED light indicates power status. Plugs into a standard power outlet. CONTENTS: Reflector (E-931ACC-R), Transmitter/Receiver (E-931-S35RR), Sensor Mounting Bracket (E-931ACC-BLS1), Reflector Mounting Bracket (E-931ACC-BLR1), Mounting Hardware. NOTE: Requires a security system or alarm device to alert you when activated.
Worked well for my Raspberry Pi system
This review is from: Seco-Larm Enforcer Reflective Beam Sensor with Square Reflector, 35 Ft. (E-931-S35RRQ)
Pros: I bought this for my garage door system I made. I didn't have any problems mounting or aiming it, and it reacts instantly to beam break/clear. I wired in a spare 12V wall-wart for power as per the instructions. Physically a lot smaller than I expected. Raspberry Pi has no problems reading the relay output.
Cons: Not really any. It just works and "does what it says on the tin"
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