The main body of each box Safe keys is made of high strength aluminum alloy, anti-corrosion and anti-rust the excellent effective, durable. The high quality aluminum alloy body can protect the key box from hammering, sawing, thus securing your belongings from theft. 7cm(L ) x 2.5cm(W) x 8cm. Mini size portable key box Large internal space allow you to store multiple keys and you can also store small things if you need. You can hang it exactly where you need it, Indoor and outdoor use, such as door handles, on doors, fences, cars or anywhere else. Without installation tools, because you don't need to fix it on the wall, remove it at any time, just like with a normal padlock. The key safe consists of a 4-digit password, there are 10,000 possibilities. The 4 position combination lock is ten times more secure than the 3 position combination lock, so don't forget your password. You can choose your favorite number from 10,000 different combinations and easily set or reset your password in minutes. Outdoor safe key box is small and portable, with a wide range of applications, unrestricted, exquisite and durable. Suitable for indoor and outdoor use, Can be applied rental (Airbnb), garage, office, school, warehouse etc. provides one year warranty, lifetime customer service. If you are not 100% SATISFIED with the key box, please contact us at any time. Product Description How to set a password? Step 1. Open the key vault with the default password (0-0-0-0) Step 2. Press the reset button on the back of the cover from "A" to "B". Step 3. Dial the password to any number you want as a new password. Step 4. Push the reset button to "A". Warm Tips: Be sure to save your password by taking a photo or note each time you reset the password password, otherwise you have no way to retrieve it. Before opening the lock, the number must be aligned with the line of the scale. It It is NOT recommended to use a combination like "0-0-0-0", otherwise it could be easily deciphered. It is recommended to rotate the dials every week for them to work properly. Specification: Inside dimensions: 7cm (length) x 2.5cm (width) x 8cm (height) / 2.76" (length) x 0 .98" (width) x 3.15" (height). External dimensions: 7.5 cm (length) x 3.5 cm (width) x 9.5 cm (height) / 2 .95" (length) x 1.38" (width) x 3.74" (height). Material: Aluminum alloy. Weight: 309g/0.68lbs What you will get: 1 x box of keys