【Ultrasonic Dog Training】Utilizes advanced ultrasonic technology to effectively deter and train dogs, emitting high-frequency sounds only audible to canines. 【Automatic Bark Detection】Automatically detects barking and emits ultrasonic waves, creating a safe and effective method to reduce excessive barking over time. 【Multiple Training Modes】Features sound training mode and ultrasonic repellent mode with three switchable ultrasonic wave patterns for varied training approaches. 【Enhanced Power Version】Equipped with a powerful 300mAh rechargeable battery, providing up to 4.5 hours of continuous operation on a single charge. 【Portable Design】Compact and lightweight ABS construction allows for easy carrying and use in various environments, with an effective range of up to 5 meters. 【User-Friendly Features】Includes a low battery indicator light and USB charging capability for convenience and extended use. Specifications: Material: ABS Battery Capacity: 300mAh Working Voltage: 3.7V Working Current: 1A Charging Voltage: 5V Charging Time: 2 hours Working Time: 4.5 hours Effective Range: 5 meters