Feature: 1. LONG LASTING LIFE: Dog barking deterrent devices with low power indicator, USB rechargeable. 300mah battery fully charged in 1 to 2 hours, normal use about 12 days. When low on power, the function button indicator will be red when pressed. 2. HIGH PERFORMANCE: Ultrasonic dog bark deterrent emits 25khz of ultrasound that easily attracts the dog's attention and makes them feel uncomfortable. Pressing the button stops the dog from barking and lets them know that bad behavior can lead to an uncomfortable experience. 3. 3 DIFFERENT FREQUENCY WAVES: Bark control devices can emit ultrasonic waves with 3 different sound waves, fluctuating frequencies of stable frequencies and irregular frequencies. Choosing different waves allows the dog to get used to simple frequencies. 4. EASY FOR OUTDOOR USE: Bark stopper is designed with a 16.5ft control range and comes with an adjustable wrist strap for easy outdoor dog walking training. Ensures they behave well in public and preserves them from unsafe food. 5. BEEP FUNCTION BUTTON: Dog barking control devices is designed with a beep function button, your dog will build a conditioned response to the beep and you can stop their bad behavior with the beep function without ultrasonic punishment. Specification: Item Type: Dog Barking Deterrent Devices Material: ABS Battery Type: Lithium Polymer Battery (Shipped with Built in Battery) Battery Model: 602025 Battery Capacity: 300mAh. Package List: 1 x Dog Barking Deterrent Devices1 x Charging Cable1 x Instruction Manual Note: This product is not waterproof, please do not put into water to clean