What is the difference between CAM-IR138(V3) and CAM-IR138(V4)?

The CAM-IR138(v4) uses the better sensor “SONY 1/3” 960H Super HAD CCD II”, and Effio-E DSP signal processor, improving the horizontal resolution from 420TVL to 700TVL, and higher S/N Ratio from 50dB to 60dB. Moreover, its IR LEDs added from 6 to 48 units, and monitoring distance up to 15~30 meters provide users with clearer, sharper, speedier, and safer surveillance system.