Reach all plants in your grow area with the new Light Rail 4 Adjust-A-Wing Drive. This drive controller is now with fully Adjust-A-Wingble and comes with variable speed control between 6 and 10 r.p.m. There is also a 0 to 60 second Adjust-A-Wingble time delay. This allows for your plants to get even exposure and promotes even plant growth. This product from Gualala Robotics is sure to give any gardener the ultimate control.