Urmet 1750 is the worse piece of crap intercom out … Seriously… If you really want sleepless nights of this intercom randomly ringing for no reason all day all night or at 2am when your sleeping. Then by all means , it’s the cheapest and most crappiest intercom you can ever think to start of with. Take my advice , after resetting it, unplugging it several times after dismounting it from the wall to stop the ringing the decision was finally made to get rid of it. Don’t believe me ? … Good luck then