Our solid forged Cadet M30 MTN crankset with installed Power meter on the left arm.  Yep, you read that right!   The 4iiii PRECISION uses their patent pending 3D power meter technology capable of measuring tri-axial strain in the crank which delivers real-time, in-depth and accurate power data in watts to cyclists and their coaches. PRECISION features both ANT+ and Bluetooth Smart wireless protocols to simplify connecting with head units, providing trail riders with the essential information they need to guide their training.   4iiii info here.
Full spec below: