Product Highlights: Ultrasonic precise repulsion, no harm and more peace of mind Scientific frequency design: emits 20-25kHz ultrasonic waves (inaudible to human ears), forming a natural stimulus to the canine auditory system, triggering its instinctive avoidance response, repelling stray or over-excited pet dogs, with zero chemical stimulation and zero physical harm throughout. Intelligent Directional Emission: 120 wide-angle ultrasonic coverage, quick effect within 3 metres to avoid accidentally injuring other animals or humans, essential for night walks, women living alone, and courier/takeaway workers on the go. Portable and long battery life, all-weather guarding Type-C fast charging: built-in 500mAh lithium battery, charging 1.5 hours battery life of 30 days (average daily use of 5 minutes), goodbye to the trouble of frequent battery replacement. Lightweight design: the whole machine weighs only 85g, size 14cm x 4cm, can be hooked up to the key chain, put into the pocket, one-handed emergencies second access second use. Dual-mode protection, full coverage of the scene Ultrasonic mode: Long press the button to continuously emit ultrasonic waves, quickly dispersing the approaching dogs. LED strong light mode: double-click the button to turn on the 120 lumens LED light, can be used as emergency lighting or dazzling deterrent, more practical for night road/garage defence. Safety & quality assurance: ECO-FRIENDLY MATERIAL: ABS+silicone shell, anti-drop and wear-resistant, IPX4 waterproof rating, normal use in rainy days/wet environment. NO DEPENDENCY: Only triggers short-term avoidance response in canines, does not cause long-term psychological trauma, humane dispersal is more responsible. Applicable Scenarios: Outdoor protection: morning run, night run, hiking with anti-dog tailing, avoiding accidental conflicts. Work scene: courier, takeaway delivery to unfamiliar areas, dispersing the guard dog in advance. Home security: women/elderly/children living alone in front of the house when encountering dogs wandering, one button remote deterrent. Pet training: Positive training aids to correct dogs barking, pouncing on people and other undesirable behaviours (with professional guidance). Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store