US221A ATEN 2 PORT PERIPHERAL SWITCH USB ATEN US221A-ATDetails Aten 2 Port USB Peripheral Sharing Device The US221A is a 2 port USB 2. 0 Peripheral Switch that allows up to 2 computers to share the use of a single USB peripheral device (such as a printer, scanner, mass storage drive, etc.) on a one at a time basis. The peripheral focus can be given to a computer manuallyby using pushbuttons on the switch, using the software basedconfiguration utility, or by the Auto Switch function. Compatible with both