Many have been using a motion sensing driveway alarm[harborfreight.com] for a few decades that does not require anyone ringing a doorbell to alert that someone is coming to the door. It often surprises 'visitors' when the door opens before they even get close to ringing the doorbell.
2 Comments
Your comment cannot be blank.
Sign up for a Slickdeals account to remove this ad.
Original/strike-thru price seems laughable
Seems decent at this price, but not amazing