This handheld 3-in-1 multifunctional device integrates ultrasonic dog repellent, pet behavior trainer and bright LED flashlight, perfectly designed for daily outdoor safety and dog training. Equipped with a built-in rechargeable lithium battery, it supports convenient Type-C fast charging, eliminating frequent battery replacement for long-term portable use. It releases high-frequency ultrasound undetectable by humans to humanely deter aggressive stray dogs and correct bad habits like continuous barking, digging and chewing without hurting pets. The dual-mode LED lighting provides steady illumination and flashing warning light for night walking, jogging or late-night commutes, boosting personal safety in dim environments. Made of durable lightweight ABS with an ergonomic grip and matching lanyard, it fits easily in pockets or bags. Adjustable ultrasonic intensity adapts to different dog breeds, with clear LED indicators showing real-time battery level. Humane, eco-friendly and multi-scenario compatible, it is an essential safety gadget for dog owners, walkers, delivery workers and outdoor lovers.