Feature: 1. Ultrasonic Design: Based on ultrasonic design, the device can effectively make your dog stop behaviors such as barking, burrowing, chewing, etc. 2. Multifunction Use: The dog behavior control device serves as a flashlight when necessary. Note: The effective range is about 7m / 23ft. 3. Easy to Operate: Open the battery cover and put 9V battery (not included), turn on the switch to work well. 4. Small and Portable: Portable design is suitable for indoor or outdoor use, convenient for you to carry for jogging or walking, cycling, etc. 5. Wide Use: The barking control device also protects you from dog attacks and is suitable for training all kinds of dogs such as pets and sheepdogs. Specification: Item Type: Ultrasonic Dog Trainer Device Material: Plastic Length: Approx. 12.5cm / 4.9in Width: Approx. 4.5cm / 1.8in Height: Approx. 2.9cm / 1.1in Weight: Approx. 53g / 1.9oz Battery: 9V Battery (not included). Package List: 1 x Ultrasonic Dog Trainer Device (Battery Not Included)1 x Manual Note: Please allow some errors due to manual measurement.