Keyscan CA4500, 4 Reader Access Control PanelCondition:* Used, Removed From Service In Working Condition. Unable To Test. As Pictured.Additional Notes:* Installation Area: Indoor* Input Voltage: 16.5 Volt AC* Interface: RS-232* Output Voltage: 12 Volt DC* Number of Readers: 4 x Card Readers and/or Keypads, 4 x Auxiliary Outputs and 16 Auxiliary Inputs* Communication options: TCP/IP, LAN/WAN, Internet, RS485* Card Capacity: 32,000 CardsKeyscanCA4500