【Protable Design - Free of Installation】Simply hang the key safe with its removable shackle - cannot be opened only when you open the key safe - on doorknob, fence, railing etc.<br> 【Suitable for Outdoor & Indoor Use】Weatherproof rust-resistant steel. Heavy duty zinc alloy and steel offers extra resistance to cutting, hammering and sawing.<br> 【Secure Storage Capacity】 Suitable for up to 5 house keys. Prevent lock-outs and provide access to your property by health aides, service technicians and pet sitters when you are at work or on vacation. Perfect solution storing keys for Airbnb rentals.<br> 【4-Digit Combination Dials】It offers up to 10,000 combination possibilities. Attached hinged cover allows for 1-handed operation. Clear instructions guide you to re-set your access code at any time. Please note that once the password is reset, it is best to take a photo to record or it will have no way to open again.<br> 【Double-Walled Construction】Flush-mount and impact-resistant access cover is impervious to hammering, sawing or prying. Confidently place the keys in heavy duty key lock box.