Casio G-Shock Master Of G-Air Gravitymaster GR-B300RY-1A9JF JDM 54.7mm 200m WR World Time JDM (Japanese domestic market) Bluetooth solar watch for men Casio G-Shock Master Of G-Air Gravitymaster GR-B300RY-1A9JF - men's watch made by Casio. It has Japanese solar quartz movement and 5719 calibre. Carbon (biomass plastic), resin (biomass), stainless steel, ip coating case of round shape. Case dimensions are 54.7 mm. in diameter and 15.7 mm. in thickness. The dial of this Casio watch is black. Display type: analog. This timepiece has mineral glass. Resin (biomass plastic) band, band color: yellow. 200 m. water resistance. The watch is from G-Shock collection. The following features are equipped: bluetooth, world time, screw-down crown, glowing hands, glowing markers, dual time, countdown timer, backlight, perpetual calendar, power reserve indicator, chronograph, alarm, date, day. Alarm The Alarm will remind you of repeated events with a beep, which you can set to any time. Backlight The backlight is a dial illumination that allows you to use this watch in the dark. Bluetooth This watch can be connected to a smartphone or PC using Bluetooth interface. Chronograph You can measure the amount of time between two events using this watch. Countdown Timer Timer indicates the end of the time period you set. Dual Time With this watch you will easily know local time in two time zones on your choice. 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. Power Reserve Indicator You will always know how much energy your watch has and when it should be charged or winded. Screw-down Crown The crown is protected by screwing mechanism, which improves water resistance. 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 G-Shock Gender Men's Movement Solar Quartz Calibre 5719 Case Material Carbon (biomass plastic), Resin (biomass), Stainless Steel, IP Coating Case Shape Round Case Size 54.7 Case Thickness 15.7 Dial Type Analog Dial Color Black Band Material Resin (biomass plastic) Band Color Yellow Water Resistance 200 Glass Mineral Features Bluetooth, World Time, Screw-down Crown, Glowing Hands, Glowing Markers, Dual Time, Countdown Timer, Backlight, Perpetual Calendar, Power Reserve Indicator, Chronograph, Alarm, Date, Day