Growsun Adjustable Indoor Moving Grow Light Mover Kit With Motor And 7ft Rail For Hydroponic Lighting System Growsun Light Mover Include a 10RPM Motor,2 Pcs 7ft Rail,2 Kits of Pulley and Nuts for Installation 10r/min Drive Motor Has a Adjustable Time Delay From 2 to 120 Seconds For Pausing the Lamp at The End of Each Run, You Can Turn the Knob Clockwise to Set Delaying Time as the Plants Need. 7ft Length Rail,Made by Aluminium Alloy,Durable and Maximum Weight Support:10Kg(22pounds) Grow Lights With the Rail Mover Can Providing a well-proportioned illumination to The Plants The Light Mover Works Well With Most Grow Lights Within 10KG(22pounds)