I have found this product to work best when NOT used with a metal rectangular case when installed in a doorway as the case is a bit large. No problem using without this case. However, the first few uses showed that the switch had a tendency to get stuck in the closed (off) position. Spring seems strong enough; However, the slider can jam if it is pushed out by the spring. Squeezing the slider a few times with your hand while wiggling it from left to right seemed to loosen it. Only graphite grease may be needed to solve the sticking problem. Overall it seems reliable but I might consider a different brand next time.
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