STOP!
Before even placing a bid on this flash, be aware that I had made the mistake of buying this bogus flash from this same vendor last year to try on my K100D, also thinking it was P-TTL. This flash is TOTALLY misrepresented and the vendor CANNOT be trusted. Not only does the vendor claim the flash is TTL for the K100D/K10D, he/she even goes to the extent of calling it a P-TTL flash!
One thing I can say is that the flash is definitely NOT P-TTL (and for $39 there's no way it would be!), and is as useful on the K100D/K10D as a random light shone at your subject. As mentioned, neither camera supports TTL (only P-TTL), so stay well away from this flash if you want a flash that works. Furthermore, this vendor was quite unhelpful and recalcitrant when it came to answering my concerns about this misrepresented product of his on eBay. I filed a complaint on the product and the vendor, and still eBay continue to permit this guy to have this fraudulent listing on their site...
See the previous thread that outlined my frustration with this flash March last year...
https://www.pentaxforums.com/forums/pentax-dslr-discussion/6255-p-ttl-flash-issues.html
In other words, don't buy it, and save your money either for a reliable Auto flash and use M mode on your K10D, or save even more money and get a 360FGZ or 540FGZ once and for all (which is what I did).