Four Door Slave Access Control Module, Support 20,000 valid cards & 30,000 records Support multiple cards Support card, password, fingerprint and combination Only work with ASC2204-H with CAN bus Wiegand or RS-485 interface to readers Door time out alarm, intrusion alarm, duress alarm and tamper alarm Anti-passback, multi-door interlock, multi-personal open Support 128 efficient time and holiday schedules Watch dog function ensure device free from halting Surface mounted installation