The Master Lock No. 5422D Portable Push Button Lock Box offers a secure, easy-to-use solution for storing spare keys or access cards. Its 3-1/8in (79mm) wide metal body ensures durability, while the over-the-door design allows for portable, hassle-free installation. A push-button mechanism with a familiar alpha/numeric keypad simplifies operation, and the ability to set your own combination using up to 12 characters adds flexibility. Protective features like a weather cover and scratch-resistant coating make it ideal for various environments.