Product description Size: 9.5*4.2*3.3cm Color: black, army green, dark gray Material: ABS Package content: 1*dog repeller 1. Handheld and convenient With adjustable hand strap. that is portable and portable, also convenient for you to carry anywhere, such as jogging or walking, cycling, park and so on. The effective range is 5 meters. 2. New version anti-barking device Frequency setting in two stages: & . It can toggle the "frequency conversion mode" of the ultrasonic level for a more obvious training effect when your dog is desensitized to the standard frequency. 3. Safe for you and dogs The average frequency range of human hearing is between 20 Hz and 20 kHz. The frequency range of dogs is between 15 Hz and 120 kHz. It produces a high level of ultrasound that can attract the dog's attention and stop bad behavior, but is harmless to humans. 4. Multi-functions Except as a pet training tool, it can also prevent dog attack, fit for training many kinds of dogs, such as pets, police dogs and shepherds, suitable for outdoor work, travel and security Night patrol. 5. Bark control for dogs works through acoustic distraction, safe for humans and animals. When training your dog with this product, it is best to cooperate with the master's voice training.