Power-upgrade compatible with the following RED and Force eTap AXS cranksets: RED 1x: 36T-46T, Force 1x: 36T-46T, Force 2x: 33/46, 35/48 AXS� enabled for easy monitoring and firmware upgrades Bluetooth Low Energy and ANT+ compatible Power readings are accurate within +/-1.5% and aren�t affected by climate conditions during a ride Power balance measures left and right legs separately Uses a common CR2032 battery that last for 200 riding hours and changes without tools Uses an 8 bolt, 107mm BCD direct mount Direct Mount BlackUPC/EAN/GTIN: 710845825583