4-Port USB - PS/2 VGA KVM Switch with Audio. CS1754 is a KVM Switch with 4 ports and supports computers with PS/2 or USB interfaces via cables and audio signal function. Moreover, it supports 3-tier connection via cascade. With 21 sets of CS1754, users can control 64 computers. CS1758 provides growing enterprises a reliable investment on comprehensive connection and long-term safe use.