Train your dog to stop barking. Ultrasonic and audible mode selections. Audible: creats harsh buzz to stop barking. High and low modes ( high for big dogs, low for small dogs) 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. Adjustable stretch collar to fit different sizes. Trigger accurately by bark vibration (can not activate by other dogs barking)

user manual 

Features

• 100% Humane and safe:harmless to your dog,no electric shock.
• Red light working indicator
• ON / OFF buttons
• High / Low volume buttons
• Powered by 2 AG10 cell batteries (included)
• For most dogs, it needs 7 to 14 days to take effect; for few dogs, it needs 4 to 6 weeks to take effect; for very few dogs,it needs longer time to take effect.

Specifications

Package Includes

• 1 X bark stop
• 1 X user manual
• 2 X cell batteries