GSTB1000D-3A series Bio-based carbon and stainless steel Solid stainless steel band Mineral glass One-touch 3-fold clasp closure Shock resistant Carbon core guard structure 200-meter water resistance Bluetooth connectivity Tough solar-powered Screw lock crown 1-second stopwatch Countdown timer Daily alarm LED light  Full auto-calendar up to year 2099 Power saving with low battery alert Accuracy: ±15 seconds per month  Dimensions: L 46.9 x W 44.2 x H 11.6 mm Compatible band size: 150-205 mm   Style: gskgstb1000d-3a Color: Silver / Green Material: Bio-based Carbon / Stainless steel