Pet Gentle Ultrasonic Anti Dog Barking Trainer LED Light Gentle Chaser Device Material: Plastic Size: 13.7 X 5.5 X 2.5CM Battery: You must bring your own 9V battery Package includes: 1 x ultrasonic dog trainer, 1 x user manual, without battery. Note: 1.Please allow 23cm differs due to manual measurement. 2.As different computers display colors differently, the color of the actual item may vary slightly from the below images, thanks for your understanding.