Product Description:Metal body (Aluminum Alloy), giving premium and solid look and feelActivity Tracking with distance, active hours, calories and stepsSmart Notifications with customized vibrations, to get all your important information right on your wrist14 days battery life to avoid frequent charging and focus on your daily activities mind freeOverview: Dimensions- 43.25 x 36.25 x 9.4mmWeight (without strap) Approx. 24.8gBody material- Aircraft grade aluminum alloy, polymer materialStrap material- Silicone, Strap length- 120 mm (long), 87 mm (short).Strap width- 20mmWaterproof rating- 5 ATM Display- 1.65" AMOLED,Resolution- 348 x 442, 341ppi, 100% NTSC.Touch screen- Corning Gorilla 3 generation tempered glass + anti-fingerprint coating.Sensors -BioTrackerTM PPGBio-Tracking Optical Sensor-6-axis acceleration sensor 3-axis geomagnetic sensor Air pressure sensor Ambient light sensor.Bluetooth- BT5.0 BLE Battery-220mAh lithium-ion polymer battery (typical value) Charging time- About 2 hours Charging method Magnetic / 2-pins POGO pin.Battery Life Daily use mode-14 days Heart rate always on, sleep monitoring; 150 pushed notifications lighting-up the screen, lift the wrist to see the time 30 times, and 5 minutes for other operations every day; exercise 3 times a week for 30 minutes with the GPS on. Basic watch mode: 46 days Turn off the Bluetooth connection, heart rate and other functions, and lift the wrist to see the time 100 times a day.Supported devices-Android 5.0 or iOS 10.0 and above.Accessories- Magnetic charging stand, user manual Application Amazfit App.