2x Free Batteries. Spare batteries can be brought from watch repair shops and some $2 shops

Ultrasonic New Bark Stop Control Dog Barking Collar

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. 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. The battery cover is a quarter turn to remove, very similar to a bayonet lightbulb. Its not a screw thread so please dont force it.

Turn Battery Cover ANTI CLOCKWISE to REMOVE Turn CLOCKWISE to secure

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