Press and hold keys for few seconds to stabilize all Relays.
This is a 4 Digits Sequential Lock. If Lock number is 7138 then you have to press first 7 then 1 then 3 then 8 else Siren with Red light will start buzzing. Keys from top left to bottom right 1 2 3......7 8 9 0.
Now try to open the lock until Blue light is glow. Press Reset Button just above Battery and clear the Red light.
