Casio's new Edifice EQB1000D-1A might just be everything you could ever want in a travel watch. It's super slim with a case that measures 8.9mm and it's got Bluetooth built-in that connects to your smartphone to automatically adjust the time in up to 300 cities across the world. On top of that, you also have Casio's Tough Solar technology so you'll never have to charge it or wind a mechanical movement ever again. It can also be charged when placed under fluorescent light and it'll stay charged for up to five months on a full charge. Other features include a sapphire crystal face, 100M water resistance, a 1/1000th second stopwatch, 200 lap memory, daily alarm, and an automatic calendar.