This HD15 VGA manual data switch box can be used to switch between four different PC / VGA devices to display on one monitor or one PC / VGA device to switch between four monitors. Connectors are fully shielded for maximum EMI/RFI protection. Heavy-duty dial contorl switch knob. Anti-skid rubber feet. HD15 15 pin connectors. HD15 I/O female x 1 + ABCD port female. Switch box does not require power. Cable required sold seperately. Standards: UL, CSA, ISO 9001:2000 manufacturer.