When I upgraded my alarm system with a new Wi-Fi based system, the signals didn't come out of the old metal box. Wall recess compared to the old surface-mounted box. This box is actually wider than you might expect (closer to 16" than 12" actually), which is a good thing because it fits nicely between the spikes - I thought the spikes were too far apart on the first friend. Tip: Don't overtighten either side at first, press each side in turn until the box is where you want it in the hole in the drywall. My WiFi signal to the alarm system has improved greatly. I can't think of any cons, hence five stars.
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