Compact and lightweight, the Sport PRO is simple, intuitive and so easy to use in one hand, you don¹t even have to look at it. It allows you to train up to 3 dogs at one time (additional dog devices required, sold separately), up to 3/4 mile away. Its quick turn dial gives positive clicks when changing between 10 stimulation levels and when controlling auxiliary functions. Sport PRO includes a built-in BarkLimiter with settable levels. Four buttons control continuous and momentary stimulation, vibration, tone and lights.