20 Suface Mount Magnetic Contacts

worked great. I was a bit worried I would have too much gap between the sensor and magnet on some of my windows. I had almost 3/4" on some windows. But these work fine. There were other reviews that these fell off the windows causing false alarms. Time will tell if this is a problem, but they seem to stick pretty well. If they fall off I will just silicone them in place. That is how the old sensors were applied. The old sensors were so sun baked they fell apart when removed by the window replacement guys. For the price these can't be beat. I bought a second order to cover all my windows, 34 in all and didn't have a single problem. It helps if you put some solder on your wires if they are stranded, or use a punch to push into the sensor before pushing the wire in. I did have some problems pushing the wires in on the first few. The wire wasn't stiff enough to shove in so I started soldering the stranded wires to make them stiff and to hold them together. I later found that if you just push something small in first it opens a small clasp so the wire goes in with no problem. The screw then forces everything closed when you make it up.

Love them, got the whole house (16 of them) hooked up while kids watched a movie, included time for an alcohol scrub to insure a clean surface for the self adhesive, granted house was prewired - really like this way more than witeless units that can be jammes and need batteries - what i really love is that it ts sooo much easier than those sets with leads.

Installs easily. Works as expected.

You can't go wrong with these they are the best bang for your buck and they work great. For my house alarm I replaced all of the units as some were stuck in the closed position.

Installed these sensors to replace those removed when we had new windows put in. After making sure the window installers kept the wires out, the sensors were relatively easy to stick on the windows and dpatio doors!

They were just right. Got new windows in the house and the alarm wires were just left hanging. 30 minutes and the alarm was working like new.

Very good product. They were easy to install on my windows and doors

These worked perfectly for me and they fit in small spaces.