What you are viewing is a Security Camera 2D Keyboard Controller, to conveniently and fully control your security cameras, this Security Camera Keyboard Controller is a great choice! The security camera 2D keyboard controller is a unit used to directly control terminal receiving devices, such as high/constant-speed dome cameras, decoders, etc. The electric outlet between the Camera Keyboard Controller and the receiving terminal is EIA/RS-485, which enables the keyboard to control as many as 32 speed dome cameras other terminal within a maximal communication range of 2000 feet. Practical and reliable, the security camera keyboard controller is what you need, do not miss it!