SN-687PT series has the 3D coordinate display function, which allows the camera to show the coordination of pan, tilt and camera angle of view (the 3D coordination). The ¨power on auto〃 restores function, as camera can restore the data before power is interrupted. This function is very useful; if the power is cut off in one district, not all the cameras need to restart after the power comes back on. The cameras will automatically resume their working states before the power went off. Quick installation and hot-swappable functions are also supported.