Feature: 1. Ultrasonic anti-barking device can automatically detect dog barking from 50 feet away. The bark control device automatically emits high-pitched sounds that only dogs can hear. After the dog stops barking, the ultrasonic bark control will automatically stop emitting ultrasonic waves. 2. Ultrasound is harmless to pets and completely inaudible to human ears, so the device can be used safely 3. Can be hung on trees, indoor, outdoor walls or fences to prevent dogs from barking (in range). When excessive barking is detected, the microphone will respond to the barking and activate the component. 4. There are 4 frequencies for ultrasonic waves to choose from. For different types of pets or animals, ultrasonic waves are more effective to stimulate. The frequency of 15/20KHz is most commonly used for dogs to stop barking 5. The sensing distance can be selected, the sensitivity can be adjusted, and the best suitable gear can be set according to the use environment. 6. The product shell is anti-ultraviolet, and the shell is not easy to fade. 7. The ultrasonic power is increased, the coverage is wider, and the ultrasonic stimulation is strong. 8. IP45 waterproof level. Specification: Material: ABS Colour: Black Battery capacity: 1500mAh Size: 12*9.5*5cm/4.7*3.54*1.97in Working Distance: 50ft/15m Color: Black, Navy Blue How to use it: Charging the collar :To charge the device ,Plug the black USB charging cable that is supplied into the bottom of the device and connect it to either a Laptop , PC or power supply that is2 amp. The device can be charged in three hours and will work continuously for 30 days . When charging the device ,the digital display will show the power level and continue to flash until it is fully charged .When the product is fully charged ,the digital display will show a"4". Before turning on the device unplug the USB charger. Turning the device ON-OFF To turn device ON press the"POWER" button down for 3 seconds and it will beep once with the digital display flashing a green number which will then disappear . To Turn device OFF press the"POWER"button down for 3 seconds and it will beep twice and turn itself off. Settings: The digital display shows the levels ofsensitivity and Frequency. You can choose to adjust the sensitivityfrom 1-4 by constantly press the Sensitivitybutton . Level 1 is the least sensitive and level 4is the most sensitive. You can choose to adjust the ultrasonic Frequencyfrom 1-4 by constantly press the Frequencybutton. Level 1-ultrasonic Frequency 15KHZ ,digital display 1 with 6seconds Level 2- ultrasonic Frequency 20KHZ ,digital display2 with 6seconds Level 3- ultrasonic Frequency 30KHZ ,digital display3 with 6seconds Level 4- ultrasonic Frequency will emit for 1-3 level 3 different ultrasonic frequency sounds with 6seconds ,digital display 4. Included: 1 x Dog Bark Stopper