The LB-21 is security lock box are custom designed for Digimaster DVRs and PixelMaster NVRs. Constructed from durable American made steel with rugged black powder coat finish, these boxes will prevent unwanted tampering. A security cam lock is provided in the hinged front panel with key that rotates a heavy duty steel tailpiece to securely lock the box. . When the front panel is open, the top lid is removable for easy installation and connection of equipment. Multiple cable knock-outs are provided in the rear bottom, and side panels to allow flexibility of cable entry and various mounting positions. An internal fan with metal guard and perforated air flow openings are provided to promote cooling of equipment. Fits to DR4HD, DR8HV, and DR16HV series.