Blackburn's Atom SL 5.0 has a ton of features to keep track of your ride. An ultra-thin and light head unit easily mounts on your stem or handlebar, and one glance at the large display will tell you what you want to know. A barometric altimeter is accurate to .1 meter keeping you posted on slope, altitude gain, and temperature. Time, distance, and speed measurements are included as well. Plus, it's wireless to keep your bike looking clean.