Quarq`s DZero powermeter now offered in conjunction with the tried and true XX1 Eagle Crankset with XSync II chainringBluetooth low energy technology and ANT+ wireless data transferMagicZero automatically checks and recalibrates your power meter as you ride no need to manually calibrateNo cadence magnet required10K Temperature CompensationCR2032 powered, 200-hour battery life and tool free replacementSwap chainrings without effecting accuracyAccurate within 1.5%, measuring both legs175x32DUBBlack104mm 4-Bolt1x12UPC/EAN/GTIN: 710845859182