Memory for my S4

This may seem like a silly question, but can sombody tell me what my memory card are called for the S4, so that I can re-order....I have tried a couple of places, and they don't seem to know what memory cards, or sticks, are compatible with what camera...I was assuming that a spealist site, who sell Memory cards on line would know...apprently not......

1 Read the manual, or:
2 Take the existing card with you to the shop, or:
3 If you've lost both, go to "links" on this site, and download the manual, but:
4 As I'm nice, here's the link: http://www.pentaxusa.com/docstore/index.cfm?show=6, however:
5 I think you'll find it's an SD card.

George

PS: And yes, you're right......!

Just to confirm what George said, it takes SD memory cards. It is also compatable with Multimedia cards (MMC), but these tend to be more expensive and slower.

I have used cards up to 512MB without problems, but have seen concerns on other forums about 1GB card support (it seems to be pretty inconsistent).