It's always been on a Uninterruptible Power Supply.
Extras:
1) I bought new the PDA-5002 video card, which has three sets of additional inputs for: (1) DVI-D, (2) S-Video + L/R RCA Audio jacks, and (3) BNC In/Out + L/R RCA Audio jacks. The plasma comes already with VGA in and a VGA out connectors, Audio in/out, and RGB/HD-VD BNC connectors.
2) I will also include the PDF-S05-LR speakers, designed specifically for the PDP-503CMX. They hook up to the sides and back of the plasma display and look great as you can see in the pictures.
3) Comes with wall mount bracket that came with the PDP-503CMS.
I have all the manual in PDF for the plasma, speakers, and video extension board.
This plasma display uses technology that Pioneer invented that is still in use today.