This printer sharing autoswitch allows up to four computers to share two parallel printers up to 4,000ft away using regular phone cord. The kit includes 4Port receiver module with 256KB memory buffer, 4 transmitter modules, and 4pcs of 33ft crossover RJ12 phone cords. (Connectors: Receiver/Switch: 4 RJ12 Female and 2 DB25 Female / Transmitter: RJ12 Female and DB25 Female)