Hunan Sainte Environmental Engineering Co., Ltd. was established on September 11, 2014, focusing on electrical equipment research and development, sales and maintenance, and integrating refrigeration equipment installation, sales and maintenance. Refrigeration equipment will add freon and ammonia and other refrigerants, long-term contact, will harm human health. The project provides the ASD5300C gas detector and the JB-TB-ASD5100 alarm controller.