The all new LightRail 4.0 AdjustaDrive is the newest linear light mover available from Gualala Robotics Inc. With both a zero to 60 second adjustable time delay for promoting even growth from end to end and a two to four feet per minute adjustable speed that covers a wide range of lamp intensities and travel distances, the all new LightRail 4 AdjustaDrive from Gualala Robotics, Inc. is designed and manufactured in the USA and is the ultimate in light mover control. Compatible with all LightRail 3.0 and 3.5 rails and accessory items.