The Lexibook LE-DJ021 has a better sensor type than most cameras of this type and age. This camera has a CCD sensor type, whereas most comparable spec digital cameras that were released more than two years ago have a Live MOS sensor type. 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.
A CCD sensor type is in fact the best sensor type amongst all cameras of a comparable type and age to the LE-DJ021.
The worst sensor type across similar types of camera is MOS.