Cellphone type power button

Thank you so much Alto for breaking up the things simpler for me. I'm proceeding to implement that circuit already.

All the MOSFETS that I found were too big in terms of size and specs as well. So I decided to use SMD P Channel FET and SMD N channel FET. Would it make any difference? if I use FETs instead of MOSFETS?

I just have to give the schematics for this hair brush and the coding file so I won't be testing them. So, I guess this will be solution for my case.

Thank you so much all of you for taking time and giving all those timely and valuable inputs.