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 barkingDigital 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 levelSpecification:Working distance: 50 feet / 15 meters15 / 20KHz frequency is most commonly used for dog barkingColor: greenPackage size: 12.5cm*9cm*5cmNote:Due to thedifferent monitor and light the actual color of the item might be slightly different from the color showed on the pictures.Please allow 1-2cm measuring deviation due to manual measurement.Welcome to Mzlx store,please rest assured to buy,if you have any questions, please feel free to contact us