Heinrich's CE500E Digital Conference System Extended Controller is a cable connection designed to work with the full digital conference system controller. It enables users to expand the system capacity by connecting more units. The device has a metal chassis and internal circuit that ensures a strengthened connection with the ground, providing a 6000V antistatic ability. The 2U metal case can be easily mounted in a standard 19-inch rack and is easy to place and maintain. The device also has a built-in universal power supply. It supports 3-channel synchronous expansion and allows for the expansion of up to 128 units.