Features: 1) Metal and plastic mixed body, sturdy and high quality 2) Quiet cooling system with roller fan 3) Advanced projection image with color fringing adjustment 4) High brightness, LCD panel allowed Specifications: 1) Working stage: 285 x 285mm 2) Projection lamp: 24V/300W or 36V/400W halogen lamp 3) Lens: a) TTB-2011: 290mm focal length, 1-element b) TTB-2021: 310mm focal length, 3-element 4) Folding post, self contained unit 5) Lamp-saver switch 6) Quick lamp changer 7) 360-degree rotatable lens holder 8) Fringing adjustment