Evertech PTZ HYBRID Controller with 3D (Pan Tilt Zoom) Joystick LCD Display Keyboard Controller Connects up to 255 both Analog and Analog High Definition Speed Dome Cameras RS485 control bus, control 255 front end address and connect 128 devices in parallel simultaneously at the most. Keyboard operation password on/off/lock function All input and output communication port use anti-radar design, powerful anti-jamming performance, the standard transmitting distance is 1200 meters Speed dome camera infinitely variable speed control Good communication compatibility, built-in many kinds of agreements