DT303 Heavy duty desk display calculator. Large 12 digit fixed angle display. Very large keypad and durable hard keys. 4 key memory. Mark up. Grand total. Backspace correction key. +/- Change sign key. Rounding & Add mode. Decimal point selector settings: 4,3,2,0 & Floating. Percentage. Double zero key. Square root. Rubber feet. Constants: Addition, Division, Multiplication & Subtraction. Solar powered with battery backup. Auto power off. Dimensions (W x D x H): 133 x 198 x 34mmWeight: 238gBackup battery ref: LR1130 or BSR54H.