BCOOSS 4 Digit Combination Black Lock Box - Practical Tool for Your Life. Made of premium and durable aluminum alloy, this waterproof and rustproof lockbox is made to long last which is effective resistance to violent damage. Now stop worry about loosing keys when go outside and keep your keys and important stuffs in place safely. Besides, our Security Key Lock Box is the perfect convenient solution for you when you want to give another person access to your home, office, store, or hide a key outside. Note: Please keep the shutter door closed for weather resistance and rotate the dials weekly to keep them work properly.