This is a mechanical timer you must have

The initial state scale is 0

Turn it clockwise to 55 minutes

Then turn it back counter clockwise to 5 minutes, after waiting 5 minutes, the timer will sound automatically

Whether you reckon the time 5 or 10 minutes, you must first twist to 55 minutes, this step is spiral spring

Mechanical structure no need battery

60 minutes timing

Material: PC

Sizes:

6.2*7.5 cm / 2.45*2.96 inch

8*6 cm / 3.15*2.36 inch