Available in both Gold and Silver, the latest Casio Ring Watch packs all the functionality of a digital watch into a miniature, wearable design. Features include dual time, a 60-minute stopwatch, LED backlight, calendar, 12/24-hour display and Time Flash function. Measuring 20mm in diameter, the ring comes with two silicone inserts to adjust the fit to 19mm or 18mm. Powered by a battery with an estimated two-year lifespan, it's a clever little piece of Casio engineering that combines everyday functionality with a unique design.