The Z80 3G SIM Card WiFi Android GPS Waterproof Heart Rate Smart Watch Phone has all the functions you want on a smart wearable device. It is quipped with MTK6580 quad-core processor to ensure quick response and smooth experience. 512MB RAM and 4GB ROM provides enough memory space for those of your entertainment. The Z80 runs on Android 5.1 OS, providing thousands of apps that you can tailor to your taste. With 3G WCDMA and independent WiFi, the world is on your hand. Built-in GPS provides convenient and accurate navigation. Heart rate sensor monitors your heart rate variation 24 hours a day. Need I say more? See its different on your own!