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3-in-1 training and anti-barking deviceDeterrent mode: Emit a high-intensity ultrasonic sound while the flashlight flashes and emits a laser as a warning to prevent dogs from approaching you. Training mode: Emit a lower intensity ultrasonic sound to assist in daily dog training. Flashlight mode: Can be used as a flashlight alone equipped with dual LED lights Its a useful tool when you take an early morning jog or evening walk. Powerful dual ultrasonic speakersDog training and bark control device uses two speakers that reach up to 16.4 ft to deter unfriendly dogs. High-frequency flashlights combined with ultrasound and laser to increase the deterrence especially at night or low-light environment. Nine-speed ultrasonic adjustablePress the MODEL key and choose gear 1-9. Different gears produce different ultrasonic pulse rates which are respectively 40KHZ and 25KHZ ultrasonic combinations.the sound doesnt affect humans but can grab dogs attention. Dog Bark Control and Dog Training Our ultrasonic anti-bark device provide a safe and effective solution for dog training and bark control. The anti-bark device can effectively train your dogs to stop unwanted behaviors such as barking digging eating unsafe food fighting etc.When the dog stops inappropriate behavior please give the dog food threats or petting to reinforce the trainings effect. Ultra battery life and rechargeablestop dog barking device is rechargeable with a standard USB included in the box. Suitable for long-distance travel indoor or outdoor activities without worrying about low power issues.