1. Keep your place safely & conveniently

a) Patented punch card key door lock has N number of holes at the card randomly and uses it as a key.

b) Lock or unlock the door by recognizing the holes depth and hole or not pierced hole without power supply.

c) In case of using 20 holes in card key, it holds high security of overlapping 1 in a million.  

d) If you want to use another digital lock, you can easily memorize password in our punch card key because memory is inside.  

2. Using method

a) Insert card key into entrance of external door lock

b) Turn the red knob. (Turn right to open and left to lock)

c) Take out (Return) the card key after done.