[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