CheckBook Calculator Auto Shut Off LC226CK Unisonic 8 Digit Display Stores account balance even after unit is turned off. Continually maintains checkbook balances. Rate button has permanent memory of tax rate. Tax button enables you to figure tax rates immediately. Full size checkbook case for Calculator, pens, pad, plastic cases for credit cards. Operates as full feature calculator. 8 digit Display. Automatic mark up function. Check Book Size