With Bluetooth connectivity and a solar charging system. The Tough Solar charging system effectively converts light from any light source to power the watch, eliminating the need to replace the battery, and Smartphone pairing via Bluetooth delivers accurate timekeeping. Combining the Carbon Core Guard structure, which protects the module and provides both shock resistance and a compact case, with G-SHOCK classic colours first used in the G-SHOCK 5600 models enables you to wear the latest, and the greatest G-SHOCK has to offer. All this with a 2 Year Manufacturers (International) warranty for added reassurance. Casio offers an exceptional range of watches for men. All with the most up-to-date designs and long-lasting durability, whether they are in the fashion, sport or technical ranges.Model Number GA-B2100-2AERBrand Casio24 Hour Counter NoAdditional Information 5 Daily Alarms: Each will sound every day at the time you set, Hourly time signal: The watch beeps every hour on the hour, Auto Calendar, Battery Level Indicator, Countdown Timer Function, Dual Illuminator, Multi Language Display, Shock Resistant, World TimeAlarm YesBacklight YesMaximum Bracelet Length 160 - 210mmBracelet Material ResinCase Diameter 45Case Thickness 11Lug Width 24Case Material ResinDate Display YesDay Display YesDial Colour BlackDisplay Type Analogue & DigitalEAN 4549526322938Gender GentsGift Box CasioGlass Type MineralGuarantee 2 Years Manufacturers (International)Luminous Hands YesLuminous Numbers/Indices NoMovement Solar PoweredStopwatch YesStyle SportsWater Resistance 200 m (20 ATM)