Motor «B» on your power-assisted bike is a «Continuous Variation transmission (CVT)»-type motor, allowing you to have high torque (65 N.m).
The CVT acts as an automatic gearing transmission.
This means you don't need shifting gears, because the motor naturally adapts the gear according to your pedaling cadence, whatever the road conditions & profile.
The cadence can be chosen according to your riding preferences.
The A-weighted emission sound pressure level at the driver ears is less than 70 dB(A)