Rotor INpower Flow Power Meter (Left Crank)An excellent onboard gauge for measuring your pedal power output, this left crank-fitting meter takes your data and wirelessly relays it to your ANT+ compatible head unit for instant analysis. An essential for the rider who trains as hard as they race, every incremental gain is accounted for with this innovative device. Reliably Accurate Power Meter with Wireless ConnectivityFitting snugly and discretely within the crank axle, this INpower is kept safe from impact and bangs to give the most accurate readings, with its long-lasting AA battery housed inside the bottom bracket spindle. Working in tandem with Trainingpeaks and ROTOR analysis software, it transmits your power, cadence and torque outputs to let you make vital adjustments to achieve your peak performance. Fit for road and off-road riders, this intuitive addition to your training setup is a definite difference-maker. Features: Material:Aluminium Axle Profile:30mm Bottom Bracket Compatibility: Universal Strain Gauges:4 Wireless Technology:ANT+ 2.4Ghz Battery:AA 1.5 volt (300 hours riding time) Compatibility:Rotor 30mm cranks Analysis Software:Trainingpeaks/ROTOR Data Transmitted:Power, Cadence, TORQUE 360, OCA, torque effectiveness (left) and pedal smoothness (left) Weight:347gBuyRotor Componentsfrom Chain Reaction Cycles, the Worlds Largest Online Bike Store.