Zenith EL PRIMERO 21 9004 Mode D'emploi page 15

5 > TIMEKEEPING FUNCTION
(A)
(B)
(C)
Switching it on/off: a single press of the push-button (A)
switches the timekeeping function on, pressing it again will
switch it off.Reviving the timekeeping function: pressing the
(A)
push-button again will revive the timekeeping function.
Resetting the chronograph: Once the chronograph has
(C)
stopped, one firm press on the push-button will send the
hand of the chronograph back and the totalisers back to zero.
Warning: Before switching the timekeeping function on, the
hands of the chronograph must be reset. If necessary, reset
using the push-button (C).
11 <