The high quality and rock-solid dependability you have come to expect from the 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 your customer to program the delay timer at the end of the rail to pause from 0 to 60 seconds. All Light Rail 3.5 components retrofit to Light Rail 3 products. Use this model for the 9' model only.