Professional cyclists need accurate power measurements which only premium products can provide and we're happy to see the Shimano Dura-Ace FC-R9200-P power meter cranks in this category. Cyclists data-driven people can rest easy knowing the reliability of the power meter readings, and we like that they get down to the smallest details that we love to dive into including left and right shoulder balance. Built-in rechargeable lithium-ion battery is easy to use and securely packaged in a waterproof design which allows you to use it in any weather conditions and provides about 300 hours of operation without the need to recharge. Bluetooth and ANT+ connectivity makes setup easy and the power meter software automatically compensates for temperature changes. This means that the readings have the same accuracy from the moment when we went from home to the top of the canyon which we are going to climb.