As vetfeva2 noted, the dual-port USB with volt meter is at Amazon for under ten dollars. I bought a couple for my 4788. When I had the bow pulpit removed I didn't reinstall the spotlight, so I had these odd-looking spotlight remote controls that didn't do anything. A friend fabricated stainless steel plates to cover the old holes and I painted the plates flat black. I zip-tied the old controls under the dash in the event a future owner wants to put a remote-controlled spotlight back in.
They look great and now I don't have to go house bank (DC) to inverter (AC) to charger (DC) to charge my iPad and phone.
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The following user(s) said Thank You: rhythmpoetdonut