Safe and Effective Behavior ModificationLooking for a safe and effective way to train your dog and modify their behavior? dog bark deterrent devices that emit ultrasonic signals between 20-25 kHz, which are inaudible to humans but can easily grab your dog's attention without causing any harm, unlike a dog whistle, these devices are a humane and gentle method for correcting unwanted behavior, stopping excessive barking, and preventing your dog from eating unsafe food. Dual Head High Range Anti-Barking DeviceSonar heads up to 35ft range effect: this anti barking device with dual heads has higher power and is more effective than the single head on the market, this electronic dog whistle equips with an 1200mah rechargeable battery, provides full charge in 1 to 2 hours for about 60 days of regular use. Two Ultrasonic ModesThis dog whistle to stop barking features two modes and a flashlight to assist with stopping excessive barking, the deterrent mode emits a high-intensity ultrasonic sound while flashing the flashlight to drive away fierce dogs, while the training mode emits a lower-intensity ultrasonic sound to aid in correcting unwanted behaviors, such as fighting, biting, and excessive barking. the flashlight also has a long-bright mode for walking your dog at night. Small and Easy to Carry and UseThis ultrasonic dog barking deterrent device features a slim design that fits comfortably in even smaller hands. The independent and clear keys make it easy to use, and the anti-mistake lock key helps prevent false triggers. Additionally, when the button is pressed, a vibration effect provides a better user experience. The device also includes a red low power indicator light and an adjustable wrist strap, making it convenient for outdoor use. Better results and more safetyDog barking deterrent devices is a more effective training method than using a bark collar, dog training clicker, or dog whistle. Its ultrasound mode can quickly correct the dog's behavior without causing pain, unlike a bark collar. Compared to a dog training clicker or dog whistle, the dog deterrent has a more significant effect.