Lens material Chemically strengthened glass Quick release bands Yes (20 mm, Industry standard) Strap material Silicone Physical size 42 x 42 x 11.6 mmFits wrists with a circumference of 126-203 mm Colour display Display Size 1.04″ (26.3 mm) diameter Display Resolution 208 x 208 pixels Display Type Sunlight-visible, transflective memory-in-pixel (MIP) Weight 37 g Battery life Smartwatch mode: Up to 2 weeksGPS mode: Up to 20 hours See details Water rating 5 ATM Memory/history 200 hours of activity data