Three upright layers: 17" (430mm) wide. Back layer is 10.2" (260mm) tall. A 17" x 5.1" (433mm x 130mm) base sits on a 1 1/2" (38mm) tall box of 17.9" x 6" (455mm x 151mm). Detailed instructions are included. Use two strings of 20 or 30 mini lights to illuminate the scene.