1 KX-TDA50G Cabinet, configured for 4 CO Lines with Caller ID and 4 Digital Hybrid Extension Ports 3 KX-DT543-B Digital Telephones System Registration Initial Custom Programming of the PBX (done remotely with the purchase of the IRMU card) First year remote firmware upgrade service First year Holiday Schedule Management 20 year Daylight Savings Time Management Complete TDA50G System Programming Backup and Backup File Storage for 5 Years Customized Telephone Button Labels Priority Access to emergency replacement hardware *Ask about 5-Year Extended Manufacturer Warranty on the PBX and cards (in addition to 2-Year Manufacturer Warranty already included)