Our large 12 volt system , comes with a high torque motor , and the swing door slinger. Comes complete with four self tapping screws to mount to the bottom of either a metal or plastic drum. Uses a 12 volt rechargeable battery , and has knock outs for the Boss Buck Box Mount solar panel , or a traditional Barrel Mounted solar panel. Choose low, medium or high RPM. Timer holder allows the timer to timer to stand upright. Timer will slide out of the holder to the right if needed.