G-Shock GST-B100D-1AER G-Steel Series G-STEEL, by G-SHOCK- the watch brand that always strives for toughness. GST-B-100 series are the first G-STEEL models to offer chronograph performance in analogue format, but still maintain the G-SHOCK level of shock resistance. The GST-B100D features a solid case and tough Stainless Steel bracelet with a comfortable fit. The dial at 9 o'clock has a multi-functional rotating disk that is cut to resemble the thick blades of a jet engine. Rotation of the blades reveals red colouring behind the disk, and this change in colour is used to indicate the battery level and the alarm on/off setting. The blades also rotate in the Timekeeping and Stopwatch modes to with the passage of time. High density mounting technology makes it possible to create a module that is smaller and thinner, which also contributes to a better fit. This watch is equipped with Bluetooth that lets it connect with a smartphone at the press of a button, and acquire time information from an internet time server. The result is accurate timekeeping no matter where in the world you happen to be. Other functions include a solar powered battery with up to two years power reserve, high brightness LED light illumination, and dual dial World Time. 24Hr Display: Y Depth: 53.8 MM Height: 14.1 MM Width: 58.1 MM Case Diameter (in cm): 5.8 Case height (in cm): 1.4 Case Length (in cm): 5.4 Case Shape: Round Case Width (in cm): 5.8 Fastening Type: Bracelet Glass: Mineral Movement: Japanese Quartz (battery) Strap Material: Stainless Steel Water Resistant: Y Bluetooth Smart Smart Access Vibration-resistant Shock-resistant Screw lock crown Stopwatch Timer Daily alarm Battery level indicator 200M water resistant