2 Dog Training Collar With Remote Vibration Only E-Collar No Shock Pet Trainer Very Humane No Pain Obedience Collars Rechargeable collars. Will work with dogs from 15 to 100 pounds. 3 levels of vibration. Button 1 will give 1 vibration, button 2 will give 2 vibrations and button 3 will give 3 vibrations Vibrate 1 dog at a time or vibrate both dogs at the same time Water-resistant collars(Not Waterproof or submersible) 6 months warranty from Dogwidgets