Quarq DZero XX1 Eagle AXS DUB Spider The Quarg DZero platform is the result of Quarq's 10+ years of advances in power meter technology. The renowned platform is now available with SRAM's innovative DUB standard to bring you the most simple spider-based power meter system. Quality materials and increased compatibility allows you to bring intelligent power on every ride. Note*XX1 Boost and non-Boost power meter spider must be paired with a XX1 Eagle(TM) DUB 8-bolt crankset and a 104BCD X-SYNC 2(TM) chainring Features Magic Zero- Automatic calibration as you ride. No need to back pedal or manually calibrate through your headunit Bluetooth low energy technology and ANT+ wireless data transfer Ax Cad - No cadence magnet required10K Temperature Compensation Battery - CR2032, 200-hour battery life, change without tools Power Balance Omni Cal - Swap chainrings without affecting accuracy2-year warranty IPX7 waterproof rating Accuracy - Within 1. 5%, measuring both legs Free firmware upgrades with the SRAM AXS app | Quarq | Dzero Xx1 Eagle Axs Dub Spider Boost, Dub, 8 Bolt Spider Only | Aluminum