I used a app called days counter.
I use magic hair remover get it off ebay or amazon, its a powder and you make the cream up with a drop of water and it doesn't burn down there its...
You could try the apple tag or Samsung tab.
Another on Netflix to watch is series called bonding.
I use magic hair removal cream,it does not burn on your balls or surrounding area. But it does smell bad after, need to open windows.