Accuracy: 2% Weight: Only adds 20gr to base crank arm Battery Life: 200 hours (coin cell: CR2032) Power range (Watts): 0 to 2500 Cadence range (rpm): 20-220 Water resistance rating: IPX7 Frame Compatibility: Most frames, see fit guide in our Support section Crank Compatibility: 2013 Cannondale Hollowgram SI cranks Device Compatibility: ANT , Bluetooth Smart Ready Software Compatibiity: Training Peaks, Strava, Garmin Training Center and others