Upgraded Adjustable Frequency Design: The dog anti barking device is designed by the latest variable frequency. Three different frequency waves can emit ultrasonic from low to high, which can avoid becoming immune to a certain frequency ultrasonic sound after a long time of adaptation .

Rechargeable : The ultrasonic dog bark control device with built-in 480mA rechargeable lithium battery can be continuous work for 15 days after fully charged in 2-3 hours. It's convenient for you to carry anywhere you need, such as jogging or walking, cycling, park and so on.No extra battery needed, it is easy and convenient for training your dogs indoor and outdoor.

2-In-1 Stop Barking & Dog Behavior Training Tool: Before dogs develop the bad habit of barking at others or an attacking mindset, an ultrasonic dog trainer can prevent and control the behavior from the day they turn 6 months old!

Safe & Harmless To You And Your Dog: The ultrasonic bark control device creates an ultrasonic sound within the dogs hearing range of 20HZ to 30KHZ. The sound does not affect humans and harmless to pets, but can easily grab the dogs attention and stop their bad behaviors.

Fit For Any Breeds Of Dogs: The dog barking devices do not work on deaf or hearing impaired dogs and under 6 months and over 8 years of dogs. And please train them with respect, do not use it as a punishment tool. Please feel free to contact us if you are not completely satisfied with our product.