Acoustic frequency: 20-25khz Sound mode: 1: continuous; 2: Intermittent; 3: Frequency hopping. Battery capacity: 300 Ma Voltage: 3.7V Charging input voltage: 5V Charging time: 1.5h Product material: ABS Key material: ABS plastic Power adapter: DC5V / 500mA Package includes: dog driver, charging line and instructions Function: Sound training mode; Ultrasonic expulsion interference mode; There are three different ultrasonic waves that can be switched; High power; When the power is low, there will be an indicator light; Rechargeable, long endurance; Application range: 5m Dog Silencer & Pet Trainer - Dog Barking Deterrent Devices from provide dog bark control and stop actions like digging, fighting, chewing furniture, eating unsafe foods, and other unwanted behaviors. Handheld & Portable - Since our antibark device for dogs is handheld, it can be used anywhere to train your dog: at home, the park, in your car. It also stops other dogs from approaching you while jogging, walking, or cycling.