A 1 timer stopwatch from SMJ - model JS - 307.
It has four functions: stopwatch, timer, temp gauge and clock.

Functions and parameters:

• The stopwatch comes with Polish instructions and is factory equipped with a battery: LR44,
• Operating temperature: 0°C~+50°C
• Melody every hour
• Hour, minutes, seconds and day of the week.
• Month and date.
• Stopwatch with 1/100th of a second accuracy, lap/interval time control.
• 4-year calendar.
• Beeper, audible alarm with melody and snooze function.
• 30-second synchronization correction.
• Time display in 12 or 24 hour format at user's choice.
• Maximum countdown time: 23 hours 59 minutes 59 seconds.
• Power supply: LR44 battery.