Recommended for real estate agent viewings, key handover for minpaku (private lodging), and key sharing among family members! Security key box key holder Please ensure that the item is installed within your own property (acts of nuisance such as installing in common areas, on street fences, or guardrails may result in cutting). Normally, there is a protective rubber cover on the outside, so the dial is not visible and it is unlikely to be tampered with (the cover only protects the front, so it is not completely waterproof). The back also has sponge attached, so it is well made to prevent rattling sounds. The set number will be sent. Align the numbers to unlock, then pull the top part towards you to open the key compartment. Close it and turn the dials to lock. Since this is the main unit only and does not include the instruction manual, I am not sure about the method of changing it, but it is likely possible as it is a simple mechanism (probably setting the desired number while it is open, then pressing A on the reset button, and then sliding L to B). Also, with the slide of the internal release button, one side of the U-shaped part opens, allowing it to be fixed to buildings such as doorknobs, rain gutters, kitchen grilles, and gates. The age is unknown. There is some dirt from sunlight in areas where the cover is not present, but there is no rust and it is in good condition. There are scratches on the top and the U-shaped part (refer to the last two photos). The cover also shows signs of use. Will be shipped via Takkyubin Compact.