The M-Wave M23HCW is a fantastic tool to complement your cycling! Featuring wireless transmission between hub and unit, this computer has 23 functions! They include current/average/maximum speed, timers, odometers, and a cadence calculator. 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 calorie consumption calculator, thermometer, metric/English conversion, a 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!