MULTI FUCTIONS AND WIDE APPLICABLE:Built-in 22 functions, speedometer for bike works well to measure speed,distance,riding time calorie counter and etc which what any serious bicyclist or fitness fanatic needs.Small size ,lightweight and wireless designmake the bicycle computer wireless suitable for most types of bicycles(may not suit for some type with large spokes) AUTO SLEEP & WAKE UP FUNCTION:After no signal inputs of 300 seconds, the screen of bike speedometer wireless will go into a standby sleep mode with LCD displays. When you shake the bike computer or any signal is inputted or any button is pressed,thiscycle computer will automatically wake up WIRELESS & WATERPROOF DESIGN:Wireless and Waterproof Design makes bike mile tracker more convenient and durable.Never worried about the complex in install the wires on your handlebars,No need to worry about rain.Simple installation that only takesa few minutes. Easy to navigate interface with only two buttons to access all measurements of the cycling computer waterproof.JUST ENJOYING YOUR RIDING