【Multi-Functionality:Dog Barking Deterrent & Behavior Training】: The three modes – High frequency flashlight, Fixed frequency ultrasonic waves (25 khz),and Variable frequency ultrasonic waves (15-30 khz),to help to stop dog barking,aggressive,chasing and other bad behaviors,best dog bark deterrent devices and dog training devices 【No Harm to Dogs】:This ultrasonic dog deterrent device is safe to dogs, adopts high-power ultrasonic intensity and two high-frequency light strobe technology, which can emit up to 10 high-frequency flashes in 1 second, with two modes of constant light and fast flashing, which can safely and effectively attract the dog's attention, allowing you to respond quickly when facing unexpected situations, and also help your dog concentrate and respond to commands more easily 【50ft Coverage & Fast Type-C Charging】:The dog barking deterrent device has a coverage range of up to 50 feet, ensuring effective dog behavior training even at a long distance, and a high-capacity 800mAh rechargeable battery that can be used for up to 30 days on a single 40-minute charge 【Built-in LED Light Makes Night Walks Easy】The other end of the dog deterrent devices is with LED light,which can be used as a flashlight,making a worry-free night walk 【Fashionable Appearance & Easy Use Design】This anti barking device for dogs is with beauty appearance and it is pocket size for easy using,makes dog barking deterrent and dog training easier