The LightRail? 4 Adjusta Drive now with fully adjustable variable speed control between 6 and 10 r.p.m. and 0 to 60 second adjustable time delay for promoting even plant growth at the ends of the lamps travel. The all New LightRail? 4 Adjusta Drive from Gualala Robotics is sure to give any gardener the ultimate control. Rail and motor kit in one box - box dimensions 41 in x 6 in x 5 in. Excellent for shipping or conserving space.