Rally power meters are tested to the extreme. So you can ride there too. The dual-sensing RS200 measures total power, cadence, left/right balance and where in the pedal stroke youre applying power to help you ride more efficiently. Compatible with SHIMANO SPD-SL cleats, the pedals install like any others and are easy to transfer between bikes.-Weight: 320 g-Water resistance: IPX7-Cleat type: SPD-SL-Q-factor: 53 mm (55 mm with provided 2 mm washer)-Stack height: 12.2 mm-Battery type: LR44/SR44 (x4) or CR1/3N (x2)-Battery life: up to 120 hours-Maximum rider weight: 105 kg-Accuracy: /- 1%-Field calibration-Adjustable release tension-Measurement location: spindle-Communication: ANT and BLUETOOTH