Casio announced this week that its G-Shock watch with low-power Bluetooth 4.0 is shipping out to U.S. retailers now, after a delay of a year or more owing to a number of issues, including flooding in Thailand. As far as smart watches go, the Casio is a little barebones: it syncs with iPhone to provide alerts for inbound emails and phone calls, and also helps you find misplaced devices by activating their ring and vibrate functions.