Introduction - If you have any usage issues, please Google them yourself
9. For the key to enter a password lock, assuming that reset after the seven lamp displays " 0" , and the use of sw1, sw2, sw3, sw4 4, just press and release any sw1, sw2 keys, and make seven Lamp displays the value add " 1" , press and release as long as any of the sw3, sw4, will make seven lamps show the value add " 2."