Baishan Control Anti Dog Barking Outdoor Ultrasonic(orange)

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
Features:
Uses ultrasonic sound to deter unwanted barking Detects barks up to 50 feet with the use of an internal microphone
4 levels of operation including a test mode
Two color LED for good /low battery indication
9V Battery operation - (battery not included)
Durable and weatherproof
Sound Activated Speaker: Produces the ultrasonic sound
Specification：
Microphone: used to detect barking
Sound activated speaker: produces the ultrasonic sound
Switch with 4 levels of operation:
OFF-used to conserve battery life
Test-used to 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
Package:1xOutdoor bark control; 1xUser manual