DVR Lock Box – if you are concerned for the physical safety and security of your DVR system then you should consider investing in a Lock Box. These lock boxes are equipped with a number of features that make them the perfect choice for your system’s protection. For instance, they are installed with an internal fan which guarantees an adequate temperature of your system and prevents it from overheating. It also has several Knock-outs for cable passes, in addition to Rubber bumpers to protect from scratching the surface it will be resting on.