Sigma's BC 1609 STS Cadence is a powerful wireless information collector in a diminutive package. Its customizable display provides a clear view of essential information during your ride, and since it is wireless with wireless cadence, it keeps a clean looking bike. After you get home, the 1609 can be plugged in to your computer with the docking station (sold separately) to automatically analyze your ride data, helping you track your training. Also, the 1609 has a backup storage chip which remembers your data even if your battery dies!