200g This camera is so light that you can comfortably carry it around all day.
Medium size Body With relatively smaller body compared to DSLRs and better ergonomics compared to Compacts,Pentax Q10is a good compromise between size and functionality.
Small 1/2.3" (6.17 x 4.55 mm) sensor Pentax Q10's small sensor struggles in low light situations compared to larger sensor.