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). Red light working indicator. ON / OFF buttons. High / Low volume buttons. Powered by 2 L1131 cell batteries (not 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

• 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.

Train your dog to stop barking. Ultrasonic and audible mode selections.usa