Yeah, you caught that too, huh.
Okey dokey, I don't get the button part. If the renter still has to put the needle in, then why not just push the injector thingie on the syringe and save the button fee?
This guy expects the person using the device to be able to find a vein in which to insert the needle? How many untrained folks could do that, alone, while supposedly sick and weak? Somebody else is going to have to be present to be the phlebotomist.