KOBRA has many innovative design features, not the least of which is its ability to use a full page (A4) 22 x 28 cm / 8-1/2" x 11" sheet. 3D objects can also be used. 550 watts - KOBRA uses two 275 watt photolamps, color corrected to 3200 degrees K for brilliant images. Has 2 LED lamp detectors. Use in normal room lighting. (The 120 volt model uses two 300 watt photolamps). Lens - 8.25 f/4.5 triplet lens made of optical quality crown glass. Enlarge to 300% and reduce to 35% on your drawing board. For floor or horizontal work, project images up to 600%. Cooling Fan - Quiet 50 cubic foot per minute power. All of this is engineered into an attractive two-tone gray and black cabinet. Made of all steel materials for long life, and portability. KOBRA is the most compact full-page projector in the market, a mere 36 x 33 x 30 cm (15" x 12" x 12"). The complete system weighs only 12 kg (26 lbs.) This high tech projector uses a unique three way adjustment/focus system, which is easier, quicker, and more accurate than all others. KOBRA has a counter balanced suspension system, so easy a child could adjust with one hand.