This dog training system comes with 1 collar that is for 1-dog training. It is the same as the two-dog training model GP001B but just comes with one collar. It has shock and vibration corrections. The vibrations have two different modes. You can use either V1,V,L1,H1 or V2,V,L2,H2 buttons to send commands(collar preset to use V1,V,L1,H1 buttons or V2,V,L2,H2, you can re-pair to switch side if you like). This sale includes: 1. One remote control w/9V battery ;2. 1 rechargeable receiver w/adjustable collar strap (6"-26"/15CM-65CM) 3. Wall charger w/ USB charging cable 4. Metal prongs, tester light 5, Manual, 6 Three-month warranty from seller.