203g 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 Q-S1is a good compromise between size and functionality.
Small 1/1.7" (7.44 x 5.58 mm) sensor Pentax Q-S1's small sensor struggles in low light situations compared to larger sensor.