​​​BEFORE  your installation,

PLEASE read and it will SAVE  your a lot of time later:


1). The most common error is battery related. Please use FOUR new batteries: two in top compartment, and two in bottom compartment,         
      and make sure they are placed correctly, according to "+/-" markings, in the battery box.

2). To avoid locking yourself out, please, Please and PLEASE: TEST & WRITE-DOWN your own Master Code
      BEFORE installing the lock on the door! 

3). The most common error (mis-understanding / mis-operation): To unlock, you need to TURN the outside Knob (keypad) to retract the latch
      WHILE it is beeping, after pressing a correct code - this is NOT a deadbolt!

                                                                                                                        ... please read further for FAQs

Watch Out for Knockoffs !!!


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 Digital Door Knobs

   For the best Price, Click Links Below from Amazon.com:

      YL-99 model with Backup Battery Box

      YL-99 B model with Backup Mechanical Key (NEW!)