Niko, they are the older style of Toucam.
The Toucam 'XS' is also known by the code PCVC720K.
They are no good for Astro work as they have a CMOS chip and are only 10 lux.
The minimum for Astro work is 1 lux.
They aren't worth more than the seller is asking as they are an outdated low grade webcam.
If you would like to check the specs, they are here:
http://www.p4c.philips.com/cgi-bin/d...uctInformation