Adjustable Frequency Technology & 2 In 1 – dog training device emits the high-pitched ultrasonic sound of different frequencies, which can avoid becoming immune to a certain frequency ultrasonic sound after a long time of adaptation , so you can use different sound waves alternately in each period of time.

Safe to You & Your Dogs – Unlike other electric shock dog training tools, ultrasonic anti-bark device uses the latest ultrasonic tech with Variable frequencies at 20HZ~20KHZ. The sound does not affect humans, but can easily grab the dog’s attention and stop their bad behaviors.

Effective Dog Bark Control Device – ultrasonic bark control device provides a safe and effective solution to assist owners in controlling unwanted barking and stop some bad behaviors of dogs, such as excessive barking, digging, chasing, eat something dirty or fighting, etc. Works well on many sizes of dogs

Usb Rechargeable & Portable Size – Unlike other dog bark repellents using AAA battery, Ultrasonic Dog Bark Control Device with built-in 300mA Rechargeable Li-ion battery can last up to 20 days without worrying about no power.

Suitable for Indoor & Ootdoor Activity – dog bark deterrent can be used either indoor for stopping unwanted barking and house-training your puppies, and for those who are adventurers, the device can also be used for dog walking and training them to behave well in public and protect them from eating unsafe food.