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WHAT IS IT? : 22 to 25 Khz ultrasonic dog repeller. Ultrasounds are waves that people do not perceive and generate discomfort in dogs. By associating that noise with a nuisance, they do not come close. ULTRASOUND: 3 powers: 1) Stable and continuous frequencies. 2) Rippling frequencies. 3) Frequencies with irregular intervals. It is recommended to use all of them to make the dog puzzled. FEATURES: Hand sized and easy to use. The red light will flash when less than 15% power. Recharges with USB (included) Includes an ultrasonic whistle. SOUNDS: includes sounds in the form of an alarm but they work independently of ultrasounds and their use is optional. That is, it is a complement to ultrasounds. DO NOT BUY IF You will use it with dogs trained to attack. Do not buy if you use it with deaf or older dogs. Do not buy if there are walls or obstacles. Do not buy if you use it long distance or if there are multiple dogs. Do not buy if you want to shut down a dog's barking.