... CO2,to make sure inside air quality . MAP lunch box fresh machine.Model :MAP-450 Used pressure :0.6-0.8MpaComposite ... suppression of bacterial growth, ensuring food, genuine, extending food freshness and shelf life. The machine applies (raw meat, fish, fresh fruits ... a high-grade fresh shelf-life, food safer does not affect the taste of food, gas and transfer of advanced methods of food preservation.