The PetSafe PBC00-11216 ultrasonic outdoor bark control unit looks like any ordinary birdhouse that can hang in a tree, on a fence post or anywhere outside. It detects barking from up to 50' away and has 3 range settings. Whenever your dog - or your neighbor's dog barks, he will hear a safe, high-pitched sound (inaudible to humans) that will stop his annoying habit. Additional features include two color LED for good/low battery indication & 4 levels of operation.

PBC00-11216 Outdoor Bark Deterrent  Features:

*Detects Bark Up to 50 Feet Away
*4 Levels of Operation Including a Test Mode
*3 Range Settings
*Uses ultrasonic Sound to Deter Nuisance Barking
*Two Color LED for Good/Low Battery Indication
*Durable & Waterproof for Outdoor Use
*Includes owner's guide

How the PBC00-11216 Bark Control Works:
When the Outdoor Bark Control is within range of a barking dog, an internal microphone picks up the sound and the unit is automatically activated. The PetSafe Outdoor Bark Control emits an ultrasonic sound. The ultrasonic sound can be heard by dogs but is silent to humans. Startled by the high-pitched sound that is safe and effective, the dog should stop barking, as it will associate its bark with this unpleasant noise. When the dog stops barking the ultrasonic sound also stops. The PetSafe Outdoor Bark Control has 3 sensitivity levels to choose from that indicate what barking level activates the unit and a test mode. It is effective up to 50 feet.