Compatible with all Shimano Hollowtech II road cranks, the Stages Shimano DURA-ACE 9200 Power Meter replaces your current left-side crank arm. Like all Stages power meters, this unit features +/- 1.5% accuracy, 200 hours of battery life and is lightweight at only 15 grams of added weight. In addition, the power meter is compatible with both ANT+ and Bluetooth SMART devices.This means you can use a bicycle computer with ANT+ or your smartphone or tablet with Bluetooth SMART. The new Stages Generation 3 power meter features radio antennas that are 6x more powerful than the previous version. This means better compatibility with both bike computers and watches. The new versions also feature improved accuracy and have an LED indicator light on the housing for improved ease of use. Crank arm lengths: 175 mm. The Stages Shimano DURA-ACE 9200 is compatible with Shimano 9200 cranksets. Left or Both Legs Measured. Expert advice and customer service in case you need any help. At Power Meter City, we focus on power meters and related accessories and components. Our focus on these products means we can offer you the best possible selection, advice and service. We have been in business since 2016 and are based in southern California. We are an authorized dealer of every product we sell. This item is in the category "Sporting Goods\Cycling\Bicycle Electronics\Power Meters". The seller is "powermetercity" and is located in this country: US. This item can be shipped to United States.