Pet Dog Repeller Anti Barking Stop Bark Training Device Trainer LED Ultrasonic 3 in 1 Anti Barking Ultrasonic Without Battery Features: Simply turn the switch and use. Effective, but harmless to humans and pets. Can be used on a daily basis with an easy-to-carry strap. Great for training a wide variety of dogs such as pets, cops and shepherds. Train pets to obey, correct misbehavior, and stop barking. describe: Completely safe and does not harm the dog. No liquid propellants are used; Therefore, this is the most humane way to protect yourself from aggressive dogs. It emits a high-pitched ultrasonic sound, inaudible to human ears, but extremely annoying to dogs. 1. Due to different monitors and lighting effects, the actual color may be slightly different from the image 2. Due to manual measurement, please allow 1-3cm deviation Specification: Material: Plastic Power supply: 9V battery (not included) Dimensions: 13 x 4 x 2.8 cm Shipping color: yellow Quantity shipped: 1