SRAM Powermeter Spider Quarq DZero AXS DUB XX1 Eagle, SPIDER ONLY (Crank Arms/Chainrings not inlcuded)Battery CR2032, 200 hours ride time Durability IPX7 waterproof rating OmniCal swap chainrings without affecting accuracy MagicZero automatic calibration during the ride Accurate within + 1. 5% measuring both legs Wireless BLE and ANT+ 10K TempComp compensates for temperature changes during a ride Firmware use SRAM AXS mobile app Compatible Chainrings SRAM X SYNC Eagle 104BCDCompatible Crankset Must use SRAM XX1 Eagle DUB 8 bolt crankset and SRAM DUB