Every innovation in Quarq’s DZero platform represented the 10+ years of Quarq’s advances in power meter technology. This same platform is now combined with SRAM’s innovative DUB technology to bring you the simplest spider-based power meter. Simplified part choices, quality materials and a broader compatibility for bottom brackets and chainrings, brings power on every ride.Key Features:Bluetooth low energy technology and ANT+ wireless data transfer,MagicZero - automatically checks and recalibrates your power meter as you ride – no need to manually calibrate,AxCad -- no cadence magnet required,10K Temperature Compensation,Battery -- CR2032, 200-hour battery life, change without tools,OmniCal -- swap chainrings without affecting accuracy,2-year warranty,IPX7 waterproof rating,Accuracy -- within 1.5%, measuring both legs.,.Specifications:Speeds: 11,Crank arm length: n/a,BB Compatibility: All SRAM Road DUB BBs,Chainring Size: No rings,Chainline: n/a,BB Spindle Interface: DUB,Chainring material: No rings,Guard: No Guard,Crank arm material: n/a,Color (Crank arm): n/a,Power Meter Type: ANT+ and BLE.