Garmin Descent Mk2S GPS Dive Computer

General Lens Material sapphire crystal Bezel Material stainless steel Case material fiber-reinforced polymer QuickFit™ watch band compatible yes (20 mm) Strap material silicone Physical size 43 x 43 x 14.15 mm  Fits wrists with the following circumference: Silicone band: 128-224 mm Extra long silicone band: 126-360 mm Color display Display Size 1.2” (30.4 mm) diameter Display resolution 240 x 240 pixels Display Type sunlight-visible, transflective memory-in-pixel (MIP) Weight silicone band: 60 g case only: 41 g Water rating Dive (100 meters) Battery life Smartwatch: Up to 7 days Battery Saver Watch Mode: Up to 21 days GPS: Up to 18 hours GPS + Music: Up to 6 hours  Max Battery GPS Mode: Up to 32 hours Dive mode: Up to 30 hours Memory/History 32 GB Clock Features Time/date GPS Time Sync Automatic daylight saving time Alarm clock Timer Stopwatch Sunrise/sunset times Health Monitoring Wrist-based heart