With Bluetooth connectivity and a solar charging system, this new GA-B2100 shock-resistant watch takes the iconic 2100 series to a whole other level. 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 45mm case and provides both shock resistance and a compact size, 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. GA-B2100-1A1ER is a black out colourway, 200m water resistant. This Casio G-shock Analogue-Digital Watch for Men is the perfect timepiece to wear or to gift. It's Black 46 mm Round case combined with the comfortable Black Plastic watch band will ensure you enjoy this stunning timepiece without any compromise. Operated by a high quality Quartz movement and water resistant to 20 bars, your watch will keep ticking. This sporty and trendy watch is a perfect gift for New Year, birthday, valentine's day and so on -The watch has a calendar function: Day-Date, Bluetooth, Solar Powered, Stop Watch, Worldtime, Alarm High quality 21 cm length and 24 mm width Black Plastic strap with a Buckle Case diameter: 46 mm,case thickness: 11 mm, case colour: Black and dial colour: Black. Upgrade the retro look you love with the octagonal GA-2100 line, which inherits the design concept of the very first G-SHOCK, but now with Smartphone Link and Tough Solar power.