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Specifications: Design: Color: Obsidian Black Size (square): 46.4*46.4*10.7mm Weight: Classic model-39g (without strap) Body: Classic-stainless steel Buttons: 2 buttons Waterproofing Grade: 5ATM8 Screen: Material: AMOLED Size: 1.39 inches Resolution: 454×454 PPI: 326 Touch Screen: Tempered glass anti-fingerprint coating ODLC coating Endurance: Battery Capacity: 471 mAh (typical value) Charging Method: Magnetic Charging Stand Charging Time: About 2.5 hours Typical Usage Battery Life: 14 days Basic Usage Battery Life: 38 days Heavy Usage Battery Life: 6.5 days