Seiko Thermic

Most quartz watches are powered by miniature batteries, but this watch is powered by converting body temperature into electricity. Once it is fully charged, it will work for about 10 months without the need for power generation. Based on my limited experience with the watch, I would call it as a hybrid which combined auto-relay technology and perpetual calendar with the new way of generating electricity through body temperature. It has a perpetual calendar function that will automatically adjust for odd and even months, including leap years until February 28, 2100. In addition, it has a power-saving mechanism that stops the display of the watch when no power is being generated to reduce power consumption (and so it will go to sleep while retaining the time in its memory). In addition, upon going to another timezone, the time can also be adjusted in one-hour units without stopping the watch and the date will change automatically according to the set time.

Source: roachman.comAdded: 16 September 2008