KEWAYO Multi Functions Wireless Cyclocomputer, Waterproof Cycling Bike Odometer Bycicle Speedometer Multi functions: Current/Average/Max speed, Elapsed time, Trip/Total Distance and Clock, etc; Offer accurate riding datas, manage your cycling life more scientific and reasonable. Practical and convenient: Km/h or Mile/h unit selectable; Computer unit can be easily mount on handbar or stem; Wireless riding data transmittion, avoid inconvenience of wire, sensor is easy to install. Automatic sleeping mode and manual awake: If no signal arrives after 300 seconds, the computer will enter sleeping mode, then all functions are auto shut off except clock for power saving. When start riding again, please press any button to start-up it. Waterproof: Riding in a rainy day is ok, but don't put in the rainstorm or soak in water for a long time. Not suiltable for stationary bike or spin bike; Suitable for all types of bicycles which spokes diameter range is 0-4.5 mm, road bike, mountain bike, folding bike, common bicycle.