The SR-50 measured 5-3/4 inches long by 3-1/8 inches wide by 1-3/16 inches high (147 mm by 78 mm by 31 mm) and was powered by a rechargeable NiCad battery pack, built from three soldered AA cells.
Like most scientific calculators, the SR-50 used ordinary infix notation, as opposed to the postfix Reverse Polish Notation (RPN) employed by its competitor, the Hewlett Packard HP-35.