W&H Perfecta 900 Instructions For Use Manual page 30

Operating controls – Speed control operation
During speed control operation, the controlled speed is saved and automatically maintained .
The motor handpiece runs independently .
Deactivation of speed control operation: Press the program button x 1 .
30

Press the button x 2 .
LED illuminates .

Start the motor handpiece
until the required speed is
reached .
After approx . 2 seconds, an
audible signal sounds and
the required speed is saved .

Stop the motor handpiece by
tapping the pedal or flap .