Compact and lightweight, the Sport PRO is simple, intuitive and so easy to use in 1 hand, you dont even have to look at it. It allows you to train up to 3 dogs (additional dog devices required, sold separately). Quick turn dial gives positive clicks when changing between 10 stimulation levels and when controlling auxiliary functions. Includes a built-in BarkLimiter with settable levels to keep things quieter. Four buttons control continuous and momentary stimulation, vibration, tone and lights. Dog devices and collars feature interchangeable, replaceable long and short contact points.