EC-443 (650-0596) Features Faxback Doc. # 7534 The Radio Shack EC-443 Solar Powered Calculator is powered by light energy and will never need batteries. If you have enough light to read by, there is enough light to power your calculator. The EC-443 has these features: Performs the four basic arithmetic operations, plus square root, percentage, and constant calculations. Has 3-key memory. Comes in a convenient leatherette case. (br/all-9/15/94)