This Sentry safe at this price range is not foolproof (I suppose not many are) but is intended to deter theft. I purchased the safe with the combination mechanical lock to avoid problems with the loss of battery life in the digital lock that I read in some reviews. The mechanical lock operates smoothly. The instructions were clear and nothing was missing from the package. I bolted down the safe unto the concrete floor with the kit provided in the box (highly recommended to keep it in place). This is an easy job for any do it yourselfer with the right tools. The safe key adds another layer of protection. If you use the key you still need the combination number to open it. The inside of the safe is adequate. If I had one criticism is that the rubber lever looks flimsy but the mechanism does have a clutch to prevent breakage or damage. Tip: buy and add additional anti-moisture packages. I recommend this product.