The LightRail? 4.0 AdjustaDrive now with fully adjustable variable speed control between 6 and 10 RPM and 0 to 60 second adjustable time delay for promoting even plant growth at the ends of the lamps travel. The all new LightRail? 4.0 AdjustaDrive 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.