Usage Tips:Large and safe storage: The capacity of the large-size key box is large enough (the internal size is about 4.5 * 3.7 * 2 inches), which can be used to store house, office or other large car keys; if necessary, you can also store some small things, such as Credit card, ID card, etc.Two unlocking methods: This password key safe includes a 4-digit password and emergency key; it allows up to 10,000 combinations to be defined. You can set your own password and change it regularly to improve security, which makes repairing difficult. If you forget the password, the emergency key will be more usefulEasy to install: This external key box is equipped with 4 screws and 4 expansion nylon wall anchors to ensure that the combination key box can be installed on any solid surface. No fuss or extra work is required to punch holes in the wall at a higher cost.Wide range of applications: This large outdoor key box can be widely used in homes, gardens, offices, etc. This will be of great help to any occasion. It allows you to save and protect your car keys while surfing, rather than risk hiding them in the sand/under rocks.