Sram spider with watts measures AXS ANT +, Bluetooth, watts measures with very high precision (maximum +/- 1.5% deviation).

Uses regular CR2032 battery that lasts approx. 200 hours drive, can be changed without tools.

Compatible with the following crankset Sram Force eTap AXS

Force 1x: 36T-46T, Force 2x: 33/46, 35/48