Ultrasonic Technology: Uses high-frequency sound waves to safely stop pet barking, aggression, and aggressive behavior without physical contact. Portable and Lightweight Design: Compact and easy to carry (110x30mm), suitable for indoor and outdoor pet training. Dual Function: Uses as both a dog repellent and a pet training tool to improve pet obedience and prevent undesirable behaviors. Safe and Humane Training: Harmless ultrasonic waves ensure stress-free training in a quiet environment. A Choice for Pet Owners and Trainers: Ideal for dog trainers, pet owners, and outdoor enthusiasts seeking an effective barking control and behavior control device. Note: 1. Actual color may vary slightly from image due to lighting conditions. 2. Due to manual measurement, please allow 1-3 cm discrepancy. Battery Capacity: 800 mAh Charging Time: 0.5 Hour Rated Frequency: 15-40 kHz Rated Power: < 3W Rated Power Supply: DC5V