10 Sets Pack of Wired Surface Mounted Alarm Magnetic Contacts Door Window Reed Switch Sensor with Double Side Tape

These window sensors worked great. A tip for installation is that if the holes for wire is too small, use the accompanying driver to insert to the hole, push it in and it will make the holes bigger. Once I got this figured out, the installation was a breeze. And they all worked. Thank you!

Perfect fit for older sensors

These work great. Responsive readings, smaller/low profile, and I appreciate the the option to either screw them in or use the attached adhesive pads.This was a welcome change after buying a different brand on Amazon that just didn't work.

Magnetic sensors were delivered in a timely manner and were a perfect fit the existing security system installation.No negative comments about the pricing and shipping arrangements.

None of the 10 pack work correctly. They are sometimes normally open, and sometimes normally closed.I installed one sensor/magnet set on a door and connected some 18/2 wire. The circuit is closed when the door is open, Open when the door is mostly closed, then closed again when the door is completely closed. I brought a magnet from another set near the sensor, and then it became normally open. The circuit was open when my test magnet was far from the sensor, and closed when the test magnet was near. I tried closing the door again, and the installed magnet changed it back to normally closed (but still also closed when the magnet is very near).I put a continuity tester on all the other sensors. initially they were all closed. I brought the magnets near each, and each time this opened the circuit, and it stayed open when the magnet was moved away.So the design seems broken in a way I don't understand and don't care to investigate more.The screw terminals are also made incorrectly. Despite being large diameter, I found it impossible to put in 18 awg solid wire, without first working the flange open with a fine pick tool. It seems like the flange is just too large for the terminal.As of writing, the product pictures depict normally open operation, despite text which says they're normally closed.Looks like they wrapped up some manufacturing reject garbage to make a quick buck.

Works great, easy install

This product was difficult to connect without the wire.

There was noting wrong with the quality of these sensors, I rated these a 3 because they did not have the gap sensitivity I needed, I returned these for a different brand that spec'ed a large gap.