Detailed Product Description Can connect 4 RFID Reader , SUPPORT 8 TTL INPUT SIGNAL FOR SENSOR SUCH DOOR STATUS INPUT , 8 RELAY OUTPUT FOR DOOR CONTROL OR ALARM SpecificationsTech character:4 doors in/out with reader ,Interfaces: wiegand interfaceSingle card, password, dual card method optional to open doors and With multi-door functions. With Access-control periods groupHuge capability: 10000 ...