Two PC share one RJ45 device such as ISDN, high speed internet cable & DSL modem connection, or vice versa. It has CAT5 internal wiring and is fully-wired to support all RJ45 datacomm applications and is guaranteed up to 10,000 switching cycles. It is approved by the Pentagons DSAWG for LAN Switches. It has metal case, heavy duty sealed rotary switch to prevent dust and moisture, gold-plated contacts and 5 Year Warranty. (Connectors: 3 RJ45 Female)