The Nikon D2HS has a CCD sensor type which is better than the MOS sensor type found on most digital cameras of this type and age. CCD sensors produce high quality, low-noise images but consume a lot more power than CMOS sensors. CCD is the most common image sensor type used in digital cameras.
This digital camera's sensor type (CCD) is actually the best sensor type amongst all comparable spec digital cameras that were released more than two years ago.
A MOS sensor type is the worst sensor type across comparable types of digital camera.