ZKTeco C3-400 PACKAGE B Users30,000,Event Buffer100,000 transactions,RAM:RAM32M,Reader Port: Qty. 426/34bit Wiegand,Qty. 48bit burst for PIN,Output Port: Qty. 21 Aux FORM-C relay output-SPDT 2A@30V AC,Qty. 21 FORM-C relay output-SPDT 5A@36V DC or 8A@30V AC ,LED: Indicatorcommunication, power, status and prox card,Environment:Operating Temperature32-113 F (0-45 C),Operating Humidity20% to 80%.