Specifications Case Diameter 48.6mm Case Thickness 13.4 mm Weight (without strap) Approx. 60 g Body Material 316L stainless steel and zirconia ceramic bezel, reinforced plastic bottom case, 316L stainless steel button and U-shaped frame Strap Material Silicone Strap Length 120 mm (long), 75 mm (short) Strap Width 22 mm Waterproof Rating 5 ATM (up to 50 meters water depth) Display 1.34" full round MIP Transflective TFT Resolution 320 x 320 Touch Screen Corning Gorilla 3 generation tempered glass + anti-fingerprint coating Sensors BioTracker™ PPG Bio-Tracking optical sensor, 6-axis acceleration sensor, 3-axis geomagnetic sensor, Air pressure sensor Connectivity Bluetooth 4.2 + BLE 5.0, WiFi 2.4GHz 802.11 b/g/n Multiple Positioning Four Satellites Three Modes (GPS + GLONASS / GPS + GALILEO / GPS + BEIDOU) Battery 300mAh lithium-ion polymer battery (typical value) Charging Time About 2.5 hours Charging Method USB Magnetic charging stand / 4-pins POGO pin Battery Life Smart mode: 7 days Factory default settings and heart rate always on. Per day: Receive 150 messages, lift the wrist to see the time 30 times, 30 minutes of outdoor sports, 5 minutes of other operations. Ultra endurance mode: 14 days Factory default settings and heart rate always on. Per day: Receive 150 messages, lift the wrist to see the time 30 times, 30 minutes of outdoor sports, 5 minutes of other operations. GPS continuous working time: Accurate Mode: 35 hours (Access Heart Rate monitor, touch function, access notifications, always-on & low consumption LCD, raise wrist to update data 10 times per hour, GPS records once per second) Balanced Mode: 45 hours (Access Heart Rate monitor, touch function, access notifications, always-on & low consumption LCD, raise wrist to update data 10 times per hour, GPS records once every 5 seconds) Power Saving Mode: 70 hours (Turnoff heart rate monitor and touch function, turnoff notifications, always-on & low consumption LCD, raise wrist to update data 10 times per hou