Description:

The device uses low-intensity ultrasound, which is silent and harmless to people. It is safe for small, medium and large dogs.
It is powered by a 9-volt replaceable battery that you can plug into the device. With the help of the internal microphone you can capture the dog's bark. When it detects a bark within 50 feet, the outdoor bark control device is automatically activated. It then emits an ultrasonic sound.
Upon hearing this high-pitched sound, the dog will immediately stop barking because it will associate its barking with this unpleasant sound. When the dog stops barking, the ultrasonic sound also stops.
This product does not work on deaf or hearing impaired dogs. There are some cases where the dog will become insensitive. To avoid this, simply turn on the outdoor bark control during unwanted barking.

Possible use for the Outdoor Bark Control Device:

Features:

Stops noisy barking dogs with harmless ultrasonic waves
Range up to 50 feet
Four adjustable ultrasonic levels (includes a test mode) Test - for verifying that the microphone and speaker are working properly. Low range-15 feet/5 meters (recommended for indoor testing) Medium range-30 feet/10 meters. High range - 50 feet/15 meters
Hard shell and weatherproof for outdoor use
Flashing LED to indicate low battery
9V battery operation - (battery not included)
Size: 6.1 x 5.5 x 6.1 inches, net weight 0.6 pounds, total weight 4 pounds.

Package includes.

Anti Barking Devices for Dogs - Ultrasonic Dog Bark Deterrent Deviceses 3 Modes, 50FT Bark Box Stop Barking Dog Barking Control Devices Outdoor Indoor, Dog Barking Silencer Safe for Human Dogs (1)