The high quality and rock solid dependability you have come to expect from Light Rail 3 now has the added flexibility of customized light distribution. The advanced Light Rail 3.5 Intelli Drive motor circuit board technology enables you to program the delay timer at the end of the rail to pause from 0 to 60 seconds. Perfect for rectangular growing areas. Expand your growing area with out buying another light. No pulleys or chains. The standard LR3.5 travels 2 feet per minute. The fast drive motor travels 4 feet per minute. Both have the Intelli drive motor which allows you to choose between a 0 to 60 second delay at each end. The robo stick helps stabilize lights that hang from the LR3.5.