The KX2 is not just a novelty anymore. Other micro cameras like the KX2 are usually crippled by a narrow 50 degree FOV, but with the KX2's improved 90 degree FOV lens, you can finally use this tiny camera to fly real FPV.
90 degree view,
10.5 x 10.5 x 17.5 mm, 2g
Model MC900D-V9 has housing.
Model MC900-V9 is without housing.