Access control Time attendance standalone system, Access mode: Card only, Pin only, Pin + Card Card Holder: ... , 5groups, 10open door conbination, supports multi-users enter. TTL for connecting to lock, door sensor, exit button, alarm LCD Panel: 4line ... keypad with 4 function keys Audio Visual Indicator: Red LED ( Access denied )/ Green LED ( Access granted ) with Audible beep Housing Material: ABS ...