The Stages PowerL Ultegra R8000 Power Meter are compatible with all Shimano road drivetrains and provides an accuracy of within +/- 1.5%. Building on what it learned with its Gen 2 Version, Stages has developed its technology even further for this latest Gen 3 model. Built on to a Shimano Ultegra R8000 non-drive side crank arm, it is individually calibrated to ensure its accuracy. Stages produce power meters that both avid amateurs and professionals at the top of their game can trust. To ensure consistency of measurement, Stages introduced a world-first feature to its power meters. This feature is called “Active temperature Compensation” and it is built in as standard to account for sudden temperature changes, which if not accounted for, would result in false and inaccurate data. Stages have made additional improvements to the Bluetooth and ANT+ transmitters and the accelerometer. This ensures a stable and powerful connection with your cycle computer is maintained and a faster sampling rate for more up-to-date feedback on your performance. Stages PowerL Ultegra R8000 Power Meter Features Accelerometer based cadence measurement Wirelessly upgradable firmware LED indicator displays battery level Updated accelerometer and addition of gyroscope Upgraded BLE and ANT+ radios offer a 6X improvement of data transmission strength Battery Life: 200+ hours (coin cell: CR2032) when used as a single sided meter Power Range (Watts): 0 to 5000 Cadence Range (rpm): 10-220 Water Resistance Rating: IPX7 Weight: Only adds 20g to base crank arm