Others have an electronic combination lock. For extra security, go for the latter. No thug can easily break into this safe. Secondly, it can keep your documents safe incase your house catches fire. Did you know that different brands offer different rates for a 350 degrees UL rating? The only way you can find out is conducting a proper online research. Some of the high-tech items even have explosion proof features. If you want to, it is easy to find a fireproof wall safe that completely match your needs.