The Stages Power L meter pairs to Shimano's Dura-Ace 9100 crank. This is the only power meter available now for Shimano's newest group. Right only power meters and full cranksets are both also available.SPECIFICATIONS:Stages Power L Accuracy: ± 1.5% (compared with Generation 2 Accuracy: ± 2%),Weight: Only less than 20gr to base crank arm,Battery Life: 200+ hours (coin cell: CR2032),Power range (Watts): 0 - 2500,Cadence range (rpm): 20 - 220,Water resistance rating: IPX7,Frame Compatibility: Most frames, see fit guide in our Support section,Crank Compatibility: All Shimano Hollowtech II road cranks,Device Compatibility: ANT+, Bluetooth Smart Ready,Software Compatibiity: Training Peaks, Strava, Garmin Training Center and others.ADDITIONAL FEATURES:Tool free battery replacement,Active temperature compensation,Accelerometer based cadence measurement,Wireless firmware upgrades.