4 Door RFID Access ControllerThis 4 way access controller can control up to 4 doors, 4 readers and 4 exit buttons. With in out management and time & attendance, every user or employee can be tracked on the time they have used the access card. Perfect for large or small businesses with up to 20,000 users and permanent entry logging up to 100,000 times. Any 12V EM, HID or Mifare access card reader, RFID keypad or door strike can be connected to this unit. Features: In Out