Dogtra 1900S Remote Training Collar - Black/Orange, 2 Collar Setboth collars and remotes charge used collar system but still works. one remote can control both collars or you can program the other remote to control one so you have a remote for each. Features: 3 4 Mile Range Rheostat Volume Dial with Stimulation Levels 0 127 2 Hour Rapid Charge Batteries Nick, Constant, and High Performance Pager Vibration Non Stimulating High Performance Pager Low to High Power Stimulation Belt Clip Modern Design Receiver Fully