ALTA 4-PORT DOOR EXP-BOARD FOR ACCESS CONTROL

4-Port Expansion Board for Access Control Panel 4-Port Expansion Board is an access control board (no enclosure, no power supply) that connects to the Access Control Core (OP-ACC) and supports up to four entries and four Avigilon Smart Readers. The 4-Port Board works with the Access Control Core to securely make all entry decisions.