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 F-91W User Guide – How to Set Time, Date, and More! - YouTube
Casio F91W-1 - Casual Sport Watch Manual
Amazon.com: Casio F91W-1 Classic Resin Strap Digital Sport Watch : Clothing, Shoes & Jewelry