Sigma Sport BC 14.12 Altitude Computer. The Sigma Sport BC 14.12 Altitude computer sports all of the classic cycling functions one expects from a well designed unit, but another world of data tracking is opened up as this is the first Sigma Sport computer to feature altitude functionality. If you have always been curious exactly how much climbing your rides feature the BC 14.12's five altitude measurements will provide all the details. Not only that, this computer also provides the current temperature. The BC 14.12 provides other smart design features such as a low battery indicator, backlight, and adjustable contrast. It's wired for superb reliability and is waterproof, too, in case you get caught out in the rain.