garmin enduro 2 speedplay Specifications of the Power Meter: including smartwatches Specifications of the Power Meter: Measurement precision ± 2% Power measurement range 20 2000 W Cadence range 20 200 rpm Weight 10 g (INPEAK device) Case tightness IP67 Manual zero offset calibration Yes Temperature compensation Yes Gyroscope + Accelerometer Yes Torque Effectiveness Yes Pedal Smoothness Yes Cycling Dynamics Yes (TWiN2) Balance L R Yes (TWiN2) Operating temperature from 5°C to +50°C Storage temperature from 20°C to +50°C Battery specifications: Battery type Li Po No tape or valve included Traditional button controls that work in any environment are matched with a responsive new touchscreen interface for quick access to selections and functions Keep going for up to 150 hours of battery life in GPS mode with solar charging1