2100 series Bio-based resin band Stainless steel dial Mineral glass Shock resistant 200-meter water resistance Tough solar-powered Wireless linking using Bluetooth Casio watches apps 300 time zones 1/100-second stopwatch Countdown timer 5 daily alarms Hourly time signal Full auto-calendar Button operation tone on / off Power saving and battery level indicator Accuracy: ±15 seconds per month Hand shift feature 12/24-hour format Dimensions: L 1.94" × W 1.75" × H 0.47"