Are you training your dog not to bark at every little thing? Do you want some help? Try our Ultrasonic Bark-Stop Collar! The adjustable stretch collar will fit almost all dogs. It does not use electric shocks to train your dog; Instead, it uses an ultrasonic signal which is harmless. The unit?? is waterproof, so it won"t be damaged by rain. It is triggered by the vibration of your dog barking, and it won"t be affected by other dogs barking.