PetsN&rsquo;all Portable Electronic Dog Repeller and Dog Trainer with LED Flashlight -Ultrasonic Deterrent Device for Your Safety and Train Your Dog ULTRASONIC PROTECTION : Repel aggressive and threatening dogs with the power of ultrasonic technology. Audible alarm to attract attention and scare away human attackers SUITABLE FOR DOG TRAINING : Ultrasonic train your dog effectively to stop annoying behaviors such as barking, chewing or jumping on guests with harmless to dog and inaudible to human ear HANDHELD & CONVENIENT : This device can be used anywhere  jogging or walking, cycling, at the park, in the car, at beach etc. EASY to carry in your pocket (2.4 x 4.1 x 1.2") WIDE COVERAGE : Working Range:16.4 feet (5M) in diameter, ultrasonic range up to 50 feet (15M), Working range: 5 meters in diameter capable to send a message to approaching dogs before they become aggressive (9-volt battery required/NOT included) LED FLASHLIGHT & BATTERY INDICATOR : Super bright LED flashlight feature is helpful for night time walking or jogging, which also functions as a battery indicator