ShurLok SL-600W-C 4 Dial Numbered Key Storage Combination Lock Box With Cable, Blue Patented dual design provides one combination for the shackle and another for the key door provide two layers of security to your property Features a durable all metal construction with a hardened steel shackle making the ShurLok and your keys very difficult to be cut or broken into Store your keys with up to 10,000 possible combinations & change your code with ease  zero locking system allows you to open your Shurlok in the dark Front opening door allows quick and easy access  it also comes with a cable keychain attachment to keep your keys and your ShurLok together at all times To learn more about ShurLok products or to view other accessories, be sure to visit the ShurLok Amazon Brand Page at www.amazon.com/shurlok