Reliable. Zhengzhou Zheng Da Security Service Co., Ltd. is a comprehensive company integrating security service, security personnel training and property management. The company was established on June 20 12. According to official website, Zhengzhou Zheng Da Security Service Co., Ltd. is very reliable, as it is known that it is a regular company protected by official website certification law. The company mainly provides personal guards and private bodyguards, as well as professional private bodyguards.