12-digit desktop calculator is made with the recycled materials of Canon copiers with the upper and lower casings being made with a high percentage of recycled material. The large LCD screen with adjustable tilt allows you to easily see all your computations. Functions include tax calculation, square root, sign change, three-key memory, multiplication, division, percentage calculations and grand total. Decimal positions include A, 4, 3, 2, 0, and F. Desktop calculator runs on solar and battery power and shuts off automatically after approximately seven minutes of nonuse.