You're ready for action! Plug the relay controlled power module into a wall outlet, then flip its switch from OFF to RESET (which means "on").
Now, plug your coffee grinder into on of the normally off outlets on the power module. Flip the grinder's own power switch to ON.
Dramatically raise the detonator hands. Yell "Fire in the hole!" or some other appropriate warning. Give the plunger a good plunge, and BOOOOM your coffee is grinding!
Beautifully ground coffee always tastes best when it's been initiated with a TNT blasting machine plunger.