The graph shows the transition in power consumption and weight of calculators from the first 14-A calculator fitted with 341 relays to the SL-800 solar calculator. Weight reduced to only 12 grams was less than 1/10,000 the weight of the 14-A, and power consumption reduced to 0.02mW was 1/15,000,000 that of the 14-A. Such remarkable lightness and compactness are the fruit of engineering plastics. (Red: Power consumption Blue: Weight)