Product Name CASIO G-SHOCK G-STEEL Solar Watch Men's Tough Solar GST-B100-1AJF Product Number GST-B100-1AJF Brand CASIO G-SHOCK Movement Analog Solar Module No.: 5513 ■Shock-Resistant Structure ■Tough Solar (Solar Charging System) ■20 ATM Water Resistance ■Mobile Link Function (Function linkage via Bluetooth communication with compatible mobile phones) ■Dual Time (With home time swap function) ■Stopwatch (1-second, 24-hour, with split) ■Timer (Set unit: 1 minute, Maximum set: 24 hours, Measures in 1-second increments) ■Alarm ■Battery indicator display ■Power saving function (In dark environments, hands stop moving after a set period to conserve power) ■Date and day of the week display ■Full Auto Calendar ■LED Light (Super Illuminator with afterglow function) ■Operating Time from Full Charge Without Solar Power: Approx. 5 months when using functions Approx. 24 months in Power Saving mode *When not paired with a smartphone, operates at standard quartz accuracy (average monthly deviation ±15 seconds). Shock Resistant Neobrite Screw-Lock Crown LED: White Crystal Material Inorganic Glass Case Material Resin/Stainless Steel Case Size 58.1×53.8mm Case Thickness 14.1mm Band Material Resin Band Band Clasp Type Fold-over Clasp Wrist Circumference (Max) 21.5cm Weight 101g