The CS17916 16-port USB HDMI KVM Switch is a multi-purpose appliance that consolidates access and control of up to 16 HDMI computers from a single USB keyboard, USB mouse and monitor console. The CS17916 can be cascaded up to two levels - to control up to 256 computers - all from a single console. In addition the CS17916 features multi-display functionality, which enables the use of standard USB cables to stack up to eight switches in a multi-display installation where each computer is fitted with multiple video cards. It allows you to contrast, analyze and monitor video output in convenient ways, substantially simplifying the working environment.Furthermore, the CS17916 comes with ATEN's on-screen display (OSD) function, which can access any computer connected to the installation, it also offers OSD configuration backup/restore to save/back up the OSD settings and restore them as needed. The CS17916 provides multimedia keyboard support and is audio enabled. You can listen to the audio output of each computer on two sets of speakers (on a one at- a-time basis).