【Ultrasonic Dog Repeller】The ultrasonic dog repeller emits powerful ultrasonic waves that can only be heard by animals. The effective range can reach 5-10 m. This dog repellent will help you escape when you encounter a dog trying to attack your dog. 【LED Indicator】This dog repellent is equipped with an ultrasonic LED indicator, power and charging indicator, which reminds you to charge when the battery is low. So you don't have to worry about the dog repellent suddenly running out of power. 【USB Powered and Long Battery Life】Built-in 350 mAh battery, charged via USB with low power consumption. Super long standby time of 30 days, up to 5 days under normal use, 2 hours fast charging. 【Portable and Lightweight】This device is small and easy to store in your pocket. It is equipped with a strap so you can take it anywhere. 【Wide Application】This is a versatile trainer that can be used for training and repelling dogs. It is an ideal choice for people who don't want to be bothered by dogs