It was designed and manufactured by Hewlett-Packard (HP).

Prices were from $450 & $550 for the low end steel or gold to $850 (the equivalent of $2200 to 4200 in 2023 dollars).

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.