I lost the adapter to plug my RCA Lyra RD2840A into the wall to charge. RCA tells me that everything on this product line is being handled by a company called Fox International, but there's no response from them. It is a size not available from regular retailers like Radio Shack. Anyone have an idea where I could get a 5.5v adapter? Or if someone has one can they provide the other specs from the outside of the adapter? Many thanks!