This is an amazing watch. If there’s a mark on it, I can’t find it. It’s Bluetooth, solar, perpetual calendar. JDM only. Full Kit. Bluetooth This watch can be connected to a smartphone or PC using Bluetooth interface. Glowing Hands The hands of this model have a luminous layer that glows in the dark. Glowing Markers The markers of this model have a luminous layer that glows in the dark. Perpetual Calendar Will automatically show you day, date and month, including leap years until the year 2100. Radio Controlled This watch receives a calibration radio signal, ensuring that the displaying time is always exact. Radio signal coverage varies by region, please confirm compatibility with your location prior to purchase. Solar Powered This watch can be charged from almost any light source and run few months or more in the dark when fully-charged. SPECIFICATION Brand Casio Collection Oceanus Gender Men’s Movement Solar Quartz Calibre 5596 Case Material Stainless Steel, Hard Coating Case Shape Round Case Size 41.4 Case Thickness 10.7 Dial Type Analog Dial Color Black Band Material Stainless Steel, Hard Coating Band Color Silver Water Resistance 100 Glass Sapphire, Antireflection Coating Features Glowing Hands, Glowing Markers, Date, Radio Controlled, Bluetooth, Perpetual Calendar