I bought some double and some single switch covers. All singles worked great. All doubles were hard to get to work. After many iterations of turning on and off, they all finally worked, but it was disappointing. As far as I could tell, they just didn't make electrical contact. One more thing about doubles: the shooters only touch one of your switches. Well all my switches were bathroom exhaust fans, no lights. The covers are activated only when the switch is off. So when I turn on the exhaust fans in the dark, the covers don't provide night lighting.
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