Pet Seat Cover Protector waterproof

Dogs quickly learn that their barking causes this irritating sound and stop barking to stop the noise. 

Ultrasonic: works by sending out an ultrasonic signal that only dogs can hear when activated by the barking.
The ultrasonic sound is 100% harmless. No shock.
Adjustable stretch collar to fit different sizes.
Trigger accurately by bark vibration (can not activate by other dogs barking).

Red light working indicator.
ON / OFF buttons.
High / Low volume buttons.
Powered by 2 AG10 cell batteries.

It emits ultrasonic beeps, an inaudible to the human ears but clearly heard by your dog. The beep is completely safe and will not hurt your dog in any way. The high and low sensitivity function allows you to select correct setting for your dogs type of bark. The unit is triggered by vibrations generated by barking of your dog and so will not be set off by the barking of other dogs