NO.1 F5 is a bracelet with built-in GPS, so that you can use the trajectory function to track your running, cycling. It also has built-in altimeter, thermometer, so that you can know the height, temperature, when you go out for hiking, climbing. It is IP67 waterproof, the best partner for outdoors. For more details, please visit No.1 F5 official page here. http://en.001phone.cn/no-1-f5-gps-smartwatch-band-html We are holding a contest for this bracelet, 10 FREE pieces and 50 pieces $19.99 in presale. Check the link above to join in this contest. GPS trajectory. Independent GPS sensor, after sports, the trajectory can sync to your phone.