A simple yet effective design, the Stages Left Arm power meter is a very lightweight solution to power measurement. With it's ± 1.5 % accuracy in all conditions, it is the most cost-effective and easy to use solution on the market. Compatible with both ANT+ / Bluetooth Smart signals, it can pair to any compatible head unit for data display. This is the Shimano Ultegra R8000 version, compatible with all Shimano cranks.