This lock box slides open after you get the 6 slider combination right each slider has 2 positions and they are customizable. the password can be easily changed too.

INSTRUCTIONS

here is a video to hopefully help you better understand 

1. put sliders in the desired order the dot on the slider corresponds to the correct position that tht slider will unlock. when the knobs on the sliders are lined up with the small line at either side, the dot will line up with either up or dn (down) which indicates the position of unlock for that slider.
2. line up the top plate with the knobs on the slider. it should be down a little bit. then push down ans slide the two plates togher to fasten them. 
3. finally put the full assembly into the box and there you go!