Efficient and Multi-functional Ultrasonic Anti-Barking Device - A safe and effective training tool for dogs, helping reduce barking as well as unwanted behaviors such as digging, eating unsafe foods, and fighting. With consistent training and appropriate rewards, you can achieve the desired results. Built-in flashlight adds nighttime convenience. Safe and Harmless with Variable Frequency Mode - Operates at 25kHz, outside typical human hearing (20Hz–20kHz), while dogs hear 15Hz–120kHz, making the ultrasonic sound effective without disturbing people. Combines fixed frequency (25kHz) and variable frequency (20–30kHz) modes to grab your dog’s attention more reliably. Compact and Easy to Use - Pocket-friendly, fits comfortably in the hand and includes a wrist strap. Ideal for indoor and outdoor use; just press the button and point at your dog to emit the ultrasonic sound. Effective on dogs of all sizes, with a slight vibration to reinforce perception. Wide Control Range and Long Battery Life - Training range of 9 meters (about 30 feet) for indoor or outdoor use, including stopping a neighbor’s dog. Built-in 800mAh battery provides up to 3 hours of use after a full 1.5-hour charge. Use scenarios - Indoor training during family time to reduce barking and other unwanted behaviors, paired with rewards. - Outdoor walks or park visits to deter barking, digging, or unsafe eating without disturbing nearby people or animals. - Nighttime use for guided, low-light training thanks to the integrated flashlight.