4iiii XTR M9020 Left Arm PowermeterMeasuring your pedal power and cadence with super-accuracy, this lightweight crank-integrated meter sends your outputs to your wireless compatible device for instant analysis and adjustments to your form. Innovative, Onboard Power and Cadence MeterDesigned especially for use with Shimano XTR M9020 cranksets, it utilises its ANT+ and Bluetooth connectivity to relay your riding information directly to your smartphone or onboard computer, giving measurements to within +/-1%, allowing you to make performance-improving adjustments in the blink of an eye. Coming with an impressive 100+ hours of battery life and an IPX7 waterproof rating for year-round use, this is a fantastic fixture for the performance-focused cyclist. Features: Accuracy: Measures to within +/-1% Crankset Compatibility: Shimano XTR M9000 Wireless Connectivity: ANT+, Bluetooth Dimensions: 37.7x27.6x7.5mm Power Range: 0-4000w Cadence Range: 30-150rpm Waterproof Rating: IPX7, IPX5 Battery: CR2032 Lithium Ion coin cell, 100+ hours Module Weight: 8g Buy 4iiii Components from Chain Reaction Cycles, the World's Largest Online Bike Store.