I use this indoors powered byhttps://amazon.com/dp/B00DKSI0S8/ref=cm_cr_ryp_prd_ttl_sol_5which has a max current of 3amps, same as the fuse requirements in the install guide. This device accepts bare wire which I connected to the metal tip of the DC transformer. I strung bare wire between Remote on and +12v so it’s always on. Remote on is meant for 12v when powered on and 0 when off so it doesn’t drain car battery.