Case size (H× W× D): 48.9 × 42.8 × 13.4 mm Weight: 53 g Case / bezel material: Resin - The resin housing is the ideal everyday companion. It is durable, lightweight and relatively insensitive to cold, heat or other external influences. Band: Resin Water resistance: 200-meter water resistance (Perfect for free diving without scuba gear: the watch is water resistant up to 20 bar according to ISO 22810) Mineral glass Power supply and battery life: Approx. battery life: 3 years on CR2016 Run time: Using activity functions (heart rate): Approx. 35 hours max. / Using in watch mode with heart rate measurement OFF: Approx. 1 month Smartphone Link feature: Mobile link (Automatic connection, wireless linking using Bluetooth®) Apps: CASIO WATCHES App connectivity feature: Auto time adjustment, Easy watch setting, Approximately 300 world time cities, App information, Time & place, Phone finder LED backlight (Super Illuminator) Auto light switch, selectable illumination duration (1.5 seconds or 3 s