Babies cannot wear gas masks. Loose fitting hood with integral carrying frame, blower, lithium battery, NP8000 filter (test data), feeding system. The battery powers the blower, which pulls contaminated air into the filter and pumps filtered air through the hood. Easy to use. Designed for immediate use after long-term storage. Made of transparent material so the baby can be seen at all times. Adjustable straps hold the infant snugly inside, and two inside zippers open easily to secure the baby. A feeding bottle and a comfortable carrying frame are included. The airflow is 3 cfm, providing positive pressure and a comfortable, protective flow through the hood. Operates at 6 volts. Airflow, 3 cfm. Shelf life, 10 years. Operating time approximately 10 hours with lithium batteries. Spare battery holder is provided so that batteries can be changed very quickly. Uses 4 AA batteries. Fitted with lithium batteries at the factory, but will accept alkaline types.