thumb|right|Hewlett-Packard HP-01 watch displaying the time
thumb|right|Hewlett-Packard HP-01 watch displaying the time
The Hewlett-Packard HP-01 is a calculator watch. It was designed and manufactured by Hewlett-Packard (HP). The HP-01 used 7 light-emitting diodes (LEDs)/digit in a 7 digit + decimal point arrangement for its digital display. Introduced in 1977 at the height of the LED watch craze, five models were available, two gold filled models and three stainless models. Prices were from to for the low end steel or gold to (). HP also sold a battery replacement kit that allowed the customers to change the batteries themselves. The watch uses two batteries for the display and one for the processor IC. It also comes with a ball-point pen with a stylus on the rear end. Most of the 28 buttons on the HP-01 are recessed, and are designed to be depressed with a stylus that is stored in the band. The production was stopped by the end of 1979.
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