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Stages Power Meter Dura-Ace 7900 
Dura-Ace 7900 left arm only power meter. If you have a Dura Ace 7900 crank only your bike you need only the lefft arm and it's a easy install.
Stages Power meter (Dura-Ace 7900) fits all styles of 7900 crankset, including: compact and standard. For those riders looking to replace an entire existing crankset should look to the Shimano Dura-Ace 9000 model, which works with existing Dura-Ace 7900 mechanical and Di2 electronic 10-speed group sets; a CN-9000 chain is recommended.
Specifications:
Accuracy: ± 2%
Weight: Only adds 20gr to base crank arm
Battery life: 200+ hours (coin cell: CR2032)
Tool free battery replacement
Active temperature compensation
Accelerometer based cadence measurement
Wireless firmware upgrades
Power range (Watts): 0 to 1999
Cadence range (rpm): 30-220
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 compatibility: Training Peaks, Strava, Garmin Training Center and others
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