High Tech Pet Sound Barrier Indoor Sonic Fence keep your dog or cat off the couch, away from the kitchen table or out of an entire room with our new sound barrier, indoor electronic fence. Features: Electronic pet containment system for dogs and cats that uses audible sound, not shock to keep your pet out of restricted areas. The unit may be placed on tabletop, by doors, bed, couch, trash can or anywhere that is "off-limits" to pets. The light-weight electronic pet collar sends an ultrasonic signal that triggers a loud sonic blast at the receiver unit when the pet approaches. Dogs and cats are easily trained to stay away of wherever you want.