8-digit dual power handheld calculator with tax function features a large LCD screen, real metal upper case, rubber keys, and extra large function buttons for easier calculation. Functions include tax calculation, square root, sign change, and three memory keys. Environmentally responsible calculator is made from the recycled materials of Canon copiers. Plastic upper and lower casings are made with post-consumer recycled material. Dual-power handheld calculator includes a protective wallet case and runs on both solar and battery power.