Function : 1:Dynamic measurement of distance , time and speed of cycling 2:Easy to search the total of distance ,time and the fastest speed 3:Function of temperature and clock 4:Display of battery voltage 5:Display of acelerating , warning for over-speed , more safety 6:Auto-hinf of bicucle maintenance 7:Dash light ,all data are clear at glance 8:Stylish design , waterproof and easy to car