It represented several innovations over those available in 1955: * all watches were analog in 1955 (as seen in the difference in the clock on Mr. Foster's Travel Agency between 1955 and 1985), * it was electrical and had no moving parts (and therefore would not have made a ticking noise), * it featured an electronic alarm, instead of a small internal vibrating clapper to make a ringing noise. * the handheld calculator of the day was an analog mechanical device called a slide rule (which, though it could be fitted onto a wristwatch (in its circular form), would certainly not have buttons),