One disadvantage I feel the fiddly setting the PIN. In addition, the description exhausted in a few abstruse tiny pictograms. To find out how I "reprogram" the lock can I had to google for half an hour on the Internet. You could have it write on the back of the blister pack: open bracket rotate through 90 ° and press into the housing, adjust the new number. I would have understood it.
In addition, the figures are in a hotel room that does not have floodlights has difficult to read. How about white numerals on a black background, or vice versa?