Product details:

Take your riding to the next level with with 4iiii Dura Ace 9100 Precision Pro dual sized power meter. Preinstalled on a Shimano 105 crank set, the lightweight unit offers ANT+ and Bluetooth compatibility as well as a breakdown of left and right wattage so you can quickly see your output balance. A single sided power meter simply doubles the output from your left leg, so with the dual sided Precision Pro you'll receive great levels of accuracy. Set up and maintenance are easy with a user-friendly app, and over-the-air upgrade capability means you will always have the latest features and updates.