Ultra-light and slim smartwatch in zinc alloy with 1.91" high-definition IPS touchscreen, offers a sharper and more colorful visual experience With Bluetooth calling function and directory of favorite contacts Includes two 22mm TPU straps in black and navy blue With 24 hour heart rate monitor, counter of steps, kilometers and calories 128 sports modes: walking, running, cycling, yoga, rope jumping, swimming in a pool (do not use in salt water), etc. Compatible with Apple Health App's Notifications Customizable screen (designs or photos) IP67* water resistant Battery life: 5-7 days in use/20 in standby (depending on use, battery life may be shorter) DaFit app Compatible with iOS 9.0 or higher and Android 6.0 or higher devices