ES-25     Digital Code Lock   ( DC 9V)    (relay contact : 2A)

This combination lock can be "unlocked" by entering a 3-digit secret code (720 possible combinations) 

To lock    : (
energizing the relay) Press any key except the key corresponding to the first digit of the secret code.
To unlock
: (
de-energizing the relay) Enter the secret code thru the keypad.  Each digit must be entered with the correct sequence. The relay will be de-energized once the correct code is entered