A wireless receiver in your home beeps four times and displays a red light when your mailbox is opened. Works on door slots and both curb-side and wall-mounted boxes. Mounts with double-sided tape. 300-ft. range, battery included.
My mail box is about 200 feet from house and cannot see from house so it saves me many trips for the mail. Excellent for my use. -
westchester county, new york.