Citizen C70 Instruction Manual page 13

*1: Race timer restart function (flyback function)
If button B is pressed during the countdown, the race timer returns to the set
time and restarts.
*2: Automatic chronograph start function
When the set time of the race timer is up, the automatic chronograph starts.
<Automatic chronograph measurement>
The automatic chronograph starts time measurement the instant the race timer
time is up. The maximum time is 23 hours, 59 minutes, 59 seconds in
increments of 1 second. After 24 hours, it returns to race timer set time.
(1) Each time button A is pressed while the automatic chronograph is in the time
measurement display, the automatic chronograph alternately stops and
restarts.
(2) If button B is pressed while the automatic chronograph is in the time
measurement display, the display returns to race timer countdown.
(3) If button B is pressed when the automatic chronograph is stopped, and the
display returns to the race timer set time.
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* Note
After race timer is switched to the automatic chronograph display, the race timer
repeats the countdown internally according to the set time.
If button B is pressed in automatic chronograph display to change to the race
timer display, the race timer indicates the remaining time (in the countdown) that
has repeatedly been checked internally. (However, if the automatic chronograph
is stopped halfway, the timer that internally continues checking time will not
stop.)
Example: When the race timer is set for 5 minutes.
The race timer repeats for 5 minutes while the automatic chronograph is in time
measurement. If button B is pressed 3 minutes after the automatic chronograph
display, 2 minutes is indicated as the remaining time of the race timer.
• Time-up warning sound
A time-up warning sound is heard when the remaining time is 10, 5, 3 minutes,
1 minute, 50 seconds, 40, 30, 20, 10, 5, 4, 3, 2 seconds and 1 second before
the set time is up.
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