[Wide Application] - This is an excellent combination key box for storing keys and bank cards etc. It can be installed in home, office, warehouse, vacation home or wherever you need.You canshare spare keys with friends, family, neighbors and caregivers. With this lockable outdoor key safe, you don't have to worry about keys hiding under the carpet. [HIGH SECURITY] - Our wall mounted key safes are made of high quality aluminum alloy body and durable steel locking mechanism to provide extra strength to the exterior key box against thepirate attacks, hammering or drilling. Weather-resistant metal material protects your keys and cards. [Reliable 4-Bit Combination] - Use 4-bit Combination for strong protection. The 4-digit combination key safe offers up to 10,000 different combinations, far more than the 3-digit model and more difficult to decipher.Easily redefine the desired combination at any time to protect your valuables. (Note: Take a photo/write it down to save your code!) [MINI SIZE AND EASY TO USE] - Exterior dimensions (H x W x D): 3.7 x 2.95 x 1.37 inches, Interior dimensions (H x W x D): 3.2 x 2 .75 x 1.1 inches. Equipped with a palm-sized key safe to store multiple keys, it is for everyday business, friends, relatives, home services, pet sitting, real estate business and Airbnb rentals, and more.