If you have ever wanted the convenience of having a beam that you can put across an area to alert you when an area has been entered, then this is the device you've been seeking!!
This has many applications including using it as an invisible playpen, store alert for customer entry, and the list continues. It has a chime sound and an alarm sound for when you want to set this up to protect an area you don't want people going into without you knowing.
You can set the chime/alarm volume to high, medium, or low. The distance that can be between the two sensors is 60 ft. maximum.
This is an affordable way to alert you when you need notification.
Dimensions:4 3/8 inches x 3 inches x 1 1/8 inches
Requires two 6-volt AC adapters (included) and three AA back up batteries (not included)