The M-Wave M30HCW is a fantastic tool to complement your cycling! Featuring wireless transmission between hub and unit, this computer has 30 functions! They include current/average/maximum speed, timers, odometers, a cadence calculator, and an altimeter for measuring climb. The device is backlit for easy reading. Mounting without tools make installing the computer a snap. You will be amazed at what all this cycling computer can tell you! Digital transmission means no annoying wires to get in your way Other functions include a heart rate monitor and alarm, a calorie consumption calculator, thermomet No tools are needed to mount at handlebar or stem Ingress Protection rating 44 means nothing larger than 1mm can penetrate the device, and it is prote Batteries are included!