1.High ABS plastic construction 2.Wide LCD 3.One key for common function 4.Main and assist control can be set if several used in the system 5.Adjust scan speed by control stick 6.Keyboard button, excellent handle, stable 7.Control load:256/bus munication mode: RS285/two group 9.Power supply: DC 9V munication distance: 1.2km munication protocol: build-in multi-protocol, optional