Features: Bark-proof controller has a carefully designed mini-shape, which can be hung on trees, indoors, outdoor walls or fence posts to prevent any dog barking within range , It can be used safely indoors and outdoors in any weather conditions. Built-in pickup to detect dog barking Digital display, rechargeable design. There are 4 frequencies to choose from, for different types of pets or animals. The sensing distance can be selected, the sensitivity can be adjusted. The outer shell of the product is anti-ultraviolet and the outer shell is not easy to fade. IP45 waterproof level. Specification: Working distance: 50 feet / 15 meters 15 / 20KHz frequency is most commonly used for dog barking 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 is≤2 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 unplugs 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. Package including： 1x Dog Barking Control Devices