Electronic Watch Dog Barking Guard Dog Alarm Chime Birds Chirping. Budget Safety When an intruder enters the triangle of protection (approx 20 feet in all directions) , it automatically begins barking like an angry dog. From outside, it sounds like you have a very unfriendly dog inside. Trust us, if you hear this thing go, your not checking to find out if its real or not The radar sensitivity is adjustable from 10-20 feet. Volume is also adjustable. Stands 8 inches tall. Powered by AC power supply. Can protect an office, warehouse, home cheaply and quickly without any setup equipment. Uses electronic radar-wave sense control, which can detect through any medium including : wood, cement, brick, glass, cardboard, curtain