Now you can have a vicious dog greet anyone who approaches your home when you are not there, scaring off would-be intruders, without the cost of dog food, vet bills, etc. The Home Safe Electronic Watch Dog emits microwave signals so it can "see" through walls and detect someone approaching from up to 21 feet away. A recording of an vicious German Shepard dog in attack mode begins to play- scarring away a would-be intruder. If the intruder continues to approach the house the barking will get louder and more frequent. Unit can be set to chime or alarm instead of the dog bark. It is powered with a 12 volt wall adapter (included), but you can also use 8 AA batteries (not included) for backup or for areas without a plug. This alarm is very effective for home, office, factory or any place that needs the constant security of a guard dog. It comes with a wireless remote control to allow you to arm/ disarm the unit from a distance as well as sound a panic alarm in case of emergency. It has adjustable volume and detection range (up to 21 feet). It measures 7 x 6 x 4 ½ inches. Please note that it will work on almost any type of wall (wood, cement, brick, stucco, etc.) but will not work on metal walls or walls with metal studs.
The main unit built-in microwave detection sensor can penetrate through wood; plastic, glass, cement (limited). It can NOT penetrate (to detect movement) through Metal, or objects containing metals, other electric onjects and ultra thick barriers (concrete block or walls).