The 3D Controlling Keyboard can be used alone or together with DVR mainframe and built-in hard disk VCR to control matching terminal products, such as high/constant- speed dome cameras, decoders, etc. The electric outlet between the controlling keyboard and the receiving terminal is EIA/RS – 485, which enables the keyboard to control as many as 127 dome cameras or decoders within a maximal communication range of 1.2 Km. Using the controlling keyboard, you can easily control and set up for variable-speed dome cameras. The controlling keyboard can also directly control terminal decoders so that the control of the front devices such as the constant-speed pan/tilt, the lens, the light, the rain brush etc can be realized. It can connect single or multi DVR mainframes or mainstream stand-alone DVRs, and it can also control all the panel-controlling function.