12 digit calculator is perfect for the occasional user, especially in a small office or home setting. Features a large LCD display for easy viewing. Environmentally friendly, this calculator is manufactured with 25% post industrial recycled plastic. Cost/sell/margin keys make for quick and easy profit margin calculations (simply enter two variables and the third automatically appears). Holds standard size paper on swing out arm or small roll inside case for ultimate portability. Operates on 4 AA batteries (not included) or on the included AC adapter.