Your serial number can be found on both ends of the packaging box stickers, as well as on the screen itself. Reference the list below on where to locate your serial number depending on the type of screen:Manual Screens --> end cap and weight barMotorize Screens --> end cap and weight barTripod Screens --> rear side of casing (left hand side)Fixed frame Screens --> rear side of frame (bottom frame)Indoor Outdoor Portable Fast Fold Screens --> rear side of frameTripod Lite --> weight bar