Cold forged AL6061/T6 aluminium crank arms,386Evo 30mm AL7050 alloy axle firs every frame (purchase BB separately),AL7075 100% CNC chainrings,Chromoly chainring bolts,Fits Shimano and Sram 10-11 speed systems,Weight: 751g.Power2max Features:simple2useAuto Zero: every time you stop pedalling for 3 seconds or more your power2max "re-zeros", no need to re-zero manually.,No cadence magnet needed: you dont need to install a cadence magnet on your bike. Your power2max calculates cadence precisely using its internal accelerometer.,Batter change: when the time come to change your battery - after 300 to 400 hours of use (6,000 to 12,000km) - you can do it yourself..±2% PrecisionPower2max power meters deliver state of the art data: they achieve an accuracy of ±2% or better including all environmental influences. power2max power meters achieves this accuracy through a refined design and high quality manufacturing processes.Designed, engineered and made in GermanyPower2max manufactures the power meters in Germany with the highest quality production standards.ANT+Power2max power meters use the ANT+ standard to transmit data wirelessly to your bike computer. The ANT+ standard guarantees reliable transmission and offers a large number of bike computers to choose from.Bluetooth readyPower2max FSA power meters are Bluetooth ready and can be upgraded to transmit the data wirelessly not only with ANT+, but also via Bluetooth communication (with purchase of firmware upgrade).UpgradeablePower2max FSA power meters can be upgraded to have the software feature of left-right balance