There are also some stand-alone DVD players that can be set up using the remote to switch regions (or be region-free), but the Panasonic isn’t one of them.
The reason the company’s spec sheets don’t usually specify the region is that it is set for whatever region it is sold in. This also means that just about any consumer DVD player can be modified to play in different regions. There are companies that will do this for you (sometimes all they need to do is pop the cover and desolder some jumpers, often they add a chip) for a certain price.
That isn’t always the best solution; not only does it void the manufacturer’s warranty, but some of them will no longer play certain DVDs, if they are set to be region-free. The companies that don’t want you buying DVDs from other regions came up with “Region-Code Enhancement” (RCE) – an enhancement that prevents the DVD from playing if the player is not set to the specific region requested by the DVD.