The Mercury watch displays time in a simple and unique way without any alphanumeric characters or traditional watch hands. Instead, the tip of inner swirl represents the current hour, while the outer swirl displays the minutes, with a continuous gradient movement showing the passage through time. Built with quality in mind, the Mercury watch is constructed using 316L stainless steel casing, case-back and fully adjustable strap. ZIIIRO Mercury does not have Luminous function. If you want Luminous function,please choose ZIIIRO ECLIPSE & TITAN & SATURN.