Key Features: The ADAMPets bark deterrent device covers a wide range at nearly 17 feet. The ultrasonic technology is safe and dog-friendly, yet effective at curbing your dog's barking. Our anti-barking device has a wide range of coverage at nearly 17 feet. This bark deterrent device offers 3 different modes offering 3 different levels of correction. Mode 1: The first mode is a Beep to warn your dog, audible to both dogs and humans. Mode 2: If the Beep doesn't work, you can activate the Ultrasonic mode which is undetectable for humans but heard by dogs and deters the unwanted behavior. Mode 3: If needed, you can activate the max deterrent option of Flashlight+ Ultrasonic which includes a high-powered LED flashlight along with the sound. While training, it's best to start with Mode 1 and move to Modes 2 and 3 if your dog does not react. This device is safe and humane and the well-being of your dog is the highest priority. At ADAMPets, we never use harmful chemicals or painful stimuli to correct dog behavior. Our anti-barking device has a long battery life of >20 hours and up to 6 months on standby. The device comes with a Type-C USB charger. The device takes approximately 2.5 hours to charge fully.