Light Rail 4.0 AdjustaDrive Motor Only, no Rail incl, Extreme Duty Trolley Wheels Now as Standard:The Light Rail 4.0 AdjustaDrive Motor has both a 0 to 60-second adjustable time delay for pausing the grow light at both ends of its travels, promoting even growth from end to end, but it also has a 2 to 4 feet (.6 to 1.2 meters) per minute adjustable speed control as the Motor goes along the Rail. This feature covers a wide range of grow light intensities and travel distances and provides considerable flexibility. The Light Rail 4.0 AdjustaDrive Motor is the ultimate in light mover control and is compatible with all Light Rail 3.0, 3.5, and 4.20 Rails and accessory items. This is the Motor Only together with Switch Stops mounting hardware, instructions, preinstalled Extreme Duty Trolley Wheels now as standard, and a two-year warranty – no Rail is included. This is ideal if you already have a Rail or if you prefer to purchase a one-piece, 2-meter (6’6” total length) Rail separately. Note: Light Rail 4.0 has an adaptable transformer power cord and works with 100 volts and 240 volts.