After moving to a PHEV I thought I should add a smoke alarm to the garage just in case. Really should have always had one. After reading I found out smoke alarms are not made for garages. You need a heat alarm. Specifically a rise over time one. Problem is I can not find a stand alone battery operated heat alarm on Amazon or Lowes. I can find hardwired ones, but my garage isn't wired for it. Does anyone know of one? Seems like someone would make one, but I can not find one.