VDO Z3 PC Link Altimeter, Heart Rate Monitor and Cycle Computer with PC Syncing Cable and Training Analysis Software Wrist-style cycling computer with heart rate monitoring and integrated altimeter Download data to PC for analysis with included software; USB docking station; compatible with Windows XP/Vista Displays current altitude and gradient in %; altitude/distance gain uphill on current trip Current heart rate in % of personal maximum heart rate; audible signal if above or below limit settings Backed by 5-year warranty