How does the Outdoor Ultrasonic Bark Control work?
Deter nuisance barking with an ornamental touch! When the Outdoor Bark Control is within range of continuous barking, an internal microphone takes up the sound and the unit is activated. The Outdoor Bark Control emits an annoying tone that only dogs can hear. Taken aback by the high-pitched sound, the dog should stop barking, as it will correlate its bark with an unpleasant noise. The Outdoor Ultrasonic Bark Control has 4 settings including 3 Sensitivity Levels and a Test Mode.
Note: If the dog is deaf or hearing impaired, he may not react to the outdoor bark control
Feature:
*Uses ultrasonic technology to stop barks, More effective and durable.
*Four adjustable ultrasonic volume levels – test, low, medium, and high, with LED battery power level indicator.
*Sensitive microphone isolates and picks up barking up to 50 feet away to stop barking both outdoors.
*Safe and humane method of bark control, suitable for all breeds and sizes of dogs.

Specifications:
Material: Plastic
Power: 1 * 9V Battery (Battery is not included)
LED Color: Green / Red
Modes:
T: Verify the microphone and speaker are functional.
1: Low range(Up to 15 feet) .
2: Medium range(Up to 30 feet) .
3: High range(Up to 50 feet) .
Item Size: Approx. 15.5 * 15.5 * 16.5cm / 6.1 * 6.1 * 6.5in (L * W * H) .
Note:
Outdoor use only.
Not for use by children.
The product will not work on deaf or hearing impaired dogs.