... power, remotion, chokey, police, etc. (BTS-2004.net) 4-Door with Single Direction Internet Controller & Access Controller System & Digital Access ... , telecom, electric power, remotion, chokey, police, etc.2.4-door with single direction control3.Card capacity: 20000pcs4.Offline memory records ... with free attendance online checking7.without power supply 2004 Four-Door TCP IP Network Access Control Board