China Aerospace Science and Technology Corporation (CASC) has announced that the Cai Hong-4 (also known as Rainbow-4 or CH-4) some changes on its unmanned aerial vehicle (UAV). Company has reported that these changes made for to expand the export portfolio.

The platform used by many countries in Asia and the Middle East. UAV’s maximum take-off weight and payload have increased and the vehicle's empty weight was also reduced. Improvements made to the UAV are equipping with a new propulsion system with higher thrust, and reducing the vehicle radar cross-section (Radar Cross-Section-RCS).