1. Petfriendly antibark device for dogs: This ultrasonic antibarking device emits a stable frequency sound audible only to dogs, eliminating annoying noises that trigger barking. It uses no irritating spray gas or electric shocks. Safe for both human and canine hearing, it creates a peaceful environment for dog lovers while curbing unwanted behavior. 2. Effective for all dog sizes: The ultrasonic antibarking device features three adjustable sensitivity and frequency levels (1530 kHz for large, energetic dogs; 20 kHz for mediumsized dogs; 30 kHz for small dogs), making it versatile for different barking behaviors. Weekly frequency adjustments help maintain training effectiveness. With a 33 ft (10 m) control range, it ensures wide coverage. 3. Easy to use: This rechargeable antibark device includes a light indicator for effortless operation. At each of the three levels, the blue light flashes every 6 seconds. When triggered by barking, the red light stays on for 3 seconds, and it flashes when battery power is low. The 3.7V 1500mAh battery provides 15 days of use after a 5hour full charge, eliminating the need for frequent battery replacements. 4. Indoor and outdoor use: Designed with IP4 rain resistance and a portable hook, this device is ideal for outdoor placement on trees, walls, or fences. Indoors, it can be placed on desks, shelves, or walls at least 1.5m for effectiveness in stopping barking, digging, fighting, and other unwanted behaviors.