MK 139 clap on/off switch

Dear Sir/Madam,
I am Sanne Bierens and sitting in my last year of school. I follow on school the profile PIE.
I have the clap on/off switch MK139 purchased for a project at school.
I do my profile workpiece about a this clap on/off switch.
I would like some more information. Such as: what stress (and) can
you turn it off? and how exactly does it work? I am interested to know where a switch is applied in the practice.
Do you have any other information of the MK139 then switch quite like.
I hope to hear from you. It has a hurry. WHO KNOWS MORE?
Best regards,
Sanne Bierens