Features1[Upgraded Version] The ultrasonic anti-barking device can automatically detect barking up to 15 meters. The bark control device automatically emits high-pitched sounds that only dogs can hear. When the dog stops barking, the ultrasonic bark control will automatically stop emitting ultrasonic waves. 2[Safety for Dogs and Humans] Ultrasound is harmless to pets and completely inaudible to human ears, so the device can be used safely. 3[Working Method] Can be hung on a tree, indoors, outdoor wall or fence to prevent dog barking (within range). When the luxurious outdoor ultrasonic bark alarm detects excessive barking, the microphone will react to the barking and activation components. 4[Internal Design] Built-in rechargeable battery, can be used continuously for one month. Waterproof shape, so you can install it anywhere with screw mounting. 4 adjustable levels of sensitivity and frequency, so you can adjust any level you want. 5[Waterproof Design] Special green, durable and waterproof, very suitable for outdoor use. Add some style to your outdoor decoration to keep your family and neighbors quiet at home and while camping.SpecificationColor: greenMaterial: ABSWaterproof level: IP45Working distance: 15 metersHow to use it:Charging the collar:To charge the device, connect the black USB charging cable provided to the bottom of the device and connect it to either a laptop, PC or power supply that is 2 amps.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 fully charged.When the product is fully charged, the digital display will show a 4. Before turning on the device, unplug the USB charger.Turn ON-OFF the deviceTo turn ON the device, press and hold the POWER button for 3 seconds and it will beep once with the digital display flashing a green number which then disappears.To turn OFF the device, press and hold the POWER button for 3 seconds and it will beep twice and turn itself off.Settings:.The digital display shows the levels of sensitivity and frequency..You can choose to adjust the sensitivity from 1-4 by continuously pressing the sensitivity button. Level 1 is least sensitive and level 4 is most sensitive..You can choose to adjust the ultrasonic frequency from 1-4 by continuously pressing the frequency button.Level 1-ultrasonic frequency 15KHZ, digital display 1 with 6 secondsLevel 2- ultrasonic frequency 20KHZ, digital display 2 with 6 secondsLevel 3- ultrasonic frequency 30KHZ, digital display 3 with 6 secondsLevel 4- ultrasonic frequency will emit for 1-3 level 3 different ultrasonic frequency sounds with 6 seconds, digital display 4.Package list1 * Ultrasonic anti-barking device