●You can mount the projector to the duct rail without any tools. Recommended for businesses, shops and homes with duct rails ●Selectable Length: You can choose the length of the arm part. The arm length is also available ●Compatible Projector Specifications: This model has 3 or more ceiling screw holes on the back of the projector. Load Capacity: 11.0 lbs (5 ●Installation: For lighting rails ●Note: It cannot pass power through the duct rails. Please prepare a separate outlet for lighting rails