The Z-7/ODG/J is a part of the Kradex, an anti-aircraft twin 20 mm cannon system. It is a computer controlled gun-laying system designed to improve the combat effectiveness of a ship’s defensive air capabilities. The Z-7/ODG/J consists of two 20mm guns, two fire control systems, sighting, and position measurement devices, two endo-atmospheric shells, and Azimuth Angle Control Mechanism. It is capable of tracking up to 8 airborne targets and engaging them with up to 4 simultaneous shots. The system is designed to take pressurized atmospheric conditions into consideration and can be mounted on a surface ship, coastal defense batteries, or on shore.