Dogwidgets DW-14 Rechargeable Remote Dog Training Vibration Collar No Harm Shock Stops dog's unwanted bad behaviors. Features 7 different levels of strong vibrations to eliminate all kind of bad behaviors. Works up to 600 feet range. Safe and effective. Very humane dog training collar, strong vibrate stops dog's bad behavior 99% of the time. 100% safe no pain no shock collar. Will work from dogs weighing 6 to 100 pounds. Fits small, medium and large dogs. Collar will work with dogs from 6 to 100 pounds with an adjustable strap from 6 to 24 inches long. Best customer support. Fast customer email and phone support with 6 months replacement warranty. BUY WITH CONFIDENCE.