Our ultrasonic system is superior to cheaper infrared devices because it allows people to come and go without triggering the alarm. The sonic alarm is triggered only by your pet's individual electronic transmitting collar. Range is fully adjustable from 1 to 35 feet.
System includes 1 Sound Barrier Receiver and 1 Pet Collar Transmitter. Transmitter comes with lithium battery included. 9 volt battery required for receiver (may be ordered below).
"Love the sound barrier for pets! Works like a charm, wish we'd found it a year ago, it would have saved a ton on other products that don't work."