*There are 2 solutions for this model as  below:

1.WT-31EH   Chip Type:ZC0301L(H)+MI360 480K pixels CMOS sensor,480K Pixel (800x600) USB1.1

2.WT-31K  Chip Type:SN9C201+MI360 1300K pixels CMOS sensor,1300K Pixel (1024x1280) USB 2.0

Feature:

*Easily E-mail digital quality photots 
*Add your video with Yahoo messenger or your favorite instant message program  
*High quality still picture&motion video capturing
*Connect quickly and easily with USB cable 
*Night version, with 8 white bright light, good use even in dark room.

Specification : 

*Color CMOS image sensor
*Resolution:  800× 600(VGA)for 480K pixel; 1024x1280(VGA)for 1300K pixel
*Frame per sec: Up to  for 480K pixel, 1300k pixel
*Capture Resolution Up to 800x600
*Focus Distance: 5cm~infinity(CIF)/3cm~infinity(VGA)
*Lens wide angle: 54 degree Diagonal
*Brightness: Auto-detect
*Exposed control: Auto-detect
*Image format: RGB 24
*Power comsumption Full Run:130mw typical(CIF)/160mw typical(VGA)
*Operated ststen: Windows98/2000/ME/XP
*I/O Interface: USB 1.1/USB 2.0, Full Speed, easily E-mail digital quality photots 
*Add your video with Yahoo messenger or your favorite instant message program  
*High quality still picture&motion video capturing 
*Connect quickly and easily with USB cable