Identification: "Sportline" on the front, "2787" on the back
A very similar manual can be found here.
- different modes (generally cycled via the middle button)
- stopwatch (count-up) — left and right bars blinking
- normal time — only one bar showing (the current day-of-week)
- set alarm — all bars showing, "Mon" is blinking
- set time/day — all bars showing, "Tue" is blinking
- to turn the alarm off, go to normal time mode, and press the left+right buttons simultaneously
stopwatch (count-up)
- start / stop — right button
- split / reset — left button
normal time mode
- display date — right button
- display alarm — left button
- enable/disable alarm — left+right buttons
set alarm
- change field (hour → minute → hour) — left button
- increment field — right button
set current time/day
Same as "set alarm" mode, except the fields that you cycle through are seconds → minutes → hours → day → month → day-of-week
when alarm sounds
- snooze — right button
- stop alarm — left button