Smart watches will get you killed at night. Al-Qaeda used the Casio F-91W - which is cheap, extremely common, weighs nothing, is water resistant, has a button for the screen light, doesn't
Casio F91W-1 Digital Watch 7 Year Battery Blue Black Microlight Classic New 79767246280 | eBay
F91W water resistance test #1 (w/ button presses) | WatchUSeek Watch Forums