Easy to install, 3M tape on the back is safe, I use rubbing alcohol to clean the surface I want to stick to and the device is secure , even if it is a wooden door. There is an interesting find. When I connect the charging cable to my Arlo security camera, the camera comes very close (1 inch) to the noopel, the noopel signal for a second. I tried several times, every time it is active like my description. After the move, Arlo Noopel is still functional. I think changing the magenitic box after plugging in the safety charger will affect the noopel. This isn't a big deal and could be caused by Arlo's EMI issue. I still give 5 stars.
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