SE CAL3800B Mini Pocket Calculator, 4.25 x 2.25-Inch Dummy solar panel; Displays up to 8 digits 3 memory keys; Requires 1AA battery (included) Functions include multiply, divide, add, subtract, square root and percentage Dimensions: 4 1/2" x 2 1/2"; Fits easily into bags, suitcases, backpacks, pockets etc. Ideal for home, office, traveling, school, business etc.