Dogwidgets DW-16 Rechargeable Remote 2 Dog Training Shock and Vibration Collar Stops dog's unwanted bad behaviors. Features strong vibrate and electric static shocks to eliminate all bad behaviors. Safe and effective. Very humane dog training collar, strong vibration stops dog's bad behavior 99% of the time. Simple design remote control transmitter. 7 total buttons to choose from for vibration and shock, no need to toggle buttons to deliver the vibration and correct level of shock. 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.