The 100CX portable cash register operates on 4 "C" size batteries (not included) for up to 8 hours of continuous use or you can use included AC adapter for standard electrical connections. The 100CX is perfect for flea markets, farm stands, vendor carts, arts and crafts shows, kiosks or anywhere electrical hookup is unavailable or costly. • Includes preset department pricing for quick, one-key sales entry • 4 Departments for different categories of merchandise • Automatic tax computation • 4 tax rates including VAT, Canadian, and add-on • 7 digit operator display