Popular Science - - GOODS -

THE AP­PLE WATCH IS THE MOST POP­U­LAR TIMEPIECE IN the world, but not every­body wants to check email on their wrist or re­mem­ber to plug in their chronome­ter ev­ery night to charge. For those folks, these el­e­gant, ac­cu­rate wear­ables use clever, time-proven en­ergy sources to run their move­ments and keep tick­ing for years. Mo­tion power

Your wrist moves as you walk, type, or play Xbox. That jostling spins a cir­cu­lar ro­tor in­side the Swatch Sis­tem51, wind­ing a spring. As it un­coils, the coil whirls the move­ment in­side the watch. Sim­i­lar time­pieces have more than 100 parts and prices be­yond four fig­ures, mak­ing this timepiece’s 51-piece in­nards and $150 sticker a lovely rar­ity.

Sun power

The Seiko Prospex is a self-suf­fi­cient timepiece. A so­lar cell un­der the dial con­stantly tops off its built-in bat­tery, which stores enough charge to last six months in the dark. The watch also sets it­self to the cor­rect time by re­ceiv­ing ra­dio sig­nals from ce­sium atomic clocks around the world that gain or lose roughly one sec­ond ev­ery hun­dred thou­sand years.

Fin­ger power

In­stead of twirling a fidget spin­ner, ro­tate the crown of the Hamilton Khaki Field Of­fi­cer. Like an au­to­matic watch, this me­chan­i­cal timepiece has a spring as its en­gine; un­like one, it re­lies on you for wind­ing. Roughly 30 sec­onds of twist­ing each day is more than enough to keep the hands con­tin­u­ously cir­cling the 1.5-inch face.

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