[Wide Application]- This is a great combination key box for storing keys and bank cards, etc. It can be installed at home, office, warehouse, vacation home, or anywhere. You can share backup keys with friends, family, neighbors, and caregivers. With this lockable outdoor key safe, you don't have to worry about your keys hiding under the carpet. [High Security]- Our wall-mounted key safe is made of high-quality aluminum alloy body and durable steel lock. A mechanism that provides extra strength to the external key box to prevent piracy, hammering, or drilling. Keys and cards are protected by weather-resistant metal material. [Trusted 4-digit combination]- Use a 4-digit combination for strong protection. The 4-digit combination key safe offers up to 10,000 different combinations, which is much more than 3-digit models and more difficult to decipher. Easily redefine your preferred combination at any time to protect your valuables. (Note: Take a photo/write it down to save the code!) [Mini Size & Easy to Use] - External Dimensions (H x W x D): 3.7 x 2.95 x 1.37 inches. Internal (H x W x D): 3.2 x 2.75 x 1.1 inches Equipped with a palm-sized key safe, it can store multiple keys, perfect for daily business, friends, relatives, home services, pet sitting, real estate business and Airbnb rentals, etc.