b[Love Dog Barking Control Device]: This kind of anti -dog control device uses ultrasonic technology to intervene in dog barking. When the microphone is detected, the automatic ultrasonic anti -dog barking device will automatically emit ultrasonic waves, causing the dog to , which has no effect on humans or other pets. [3 adjustable mode and 33FT range]: There are three adjustable modes of barking device-high, medium, and low, suitable for 15kHz-30KHz (high level) of large and , suitable for mild dogs 20KHz (medium level), and 30kHz (low level) suitable for small dogs. The maximum effective range of this ultrasonic barking device is 33FT. [Light and portable]: The appearance of this dog's box is small and light, easy to carry. You can install it on a tree, a dog's nest, a table, or any place you think are convenient to use. You can also carry it with you for outdoor activities for outdoor use. [IPX4 Waterproof Dog Box]: The device uses IPX4 material waterproof shell. Professional waterproof design allows you to use dog -proof equipment without worrying about weather factors. For some sudden weather conditions, such as rain and snow weather, the dog sounds can still work normally under these bad weather conditions, free your hands, and bring you great convenience. [ and charging]: This dog call box is equipped with 1500mAh to charge lithium batteries. It can work for 30 days after charging for 5 hours. The shell material is solid and , without other complex operations. The receipt is used to use the barking device (better charging effect before use). Material: plastic colour: black Package Contents: 1 x Dog Barking Deterrent Control Bark Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.