【Ultrasonic Dog Training】This portable device uses ultrasonic technology to effectively deter and train dogs, helping to reduce excessive barking. 【Human-Friendly Operation】The ultrasonic sound is only audible to dogs, making it safe and non-disruptive for human use in various environments. 【Behavior Modification】Through repeated use, dogs associate barking with the uncomfortable ultrasonic sound, gradually reducing their tendency to bark excessively. 【Multi-Wave Technology】Advanced multi-wave processing prevents dogs from becoming immune to the sound, ensuring long-term effectiveness of the device. 【Easy Operation】Simply press and hold the switch to activate the ultrasonic waves and flashing light. Release to turn off the device. 【Rechargeable Battery】Equipped with a 300mAh polymer lithium battery, providing up to 1 hour of continuous use on a full charge. 【Compact Design】The mini size makes it convenient to carry and use wherever needed for dog training or bark control. Specifications: Battery Capacity: 300mAh Battery Type: Polymer Lithium Battery Battery Model: 602030 Operating Current: 300mA Charging Voltage: 5V Continuous Operating Time: 1 hour LED Type: LED Ultrasonic Power: 40kHz Charging Time: 30 minutes Material: PC/ABS Notes: 1. The product utilizes ultrasonic wave technology; the effect may vary depending on the dog type. 2. The product emits strong light. Do not look directly into it to avoid eye injury. 3. The product is not waterproof; do not immerse it in water or expose it to rain.