1. gas capacity in air cell:8.5 litre 2. the weight of compressed gas in air cell:17g 3. inflating time: ???seconds 4. buoyancy:10kg 5. min expiry time of gas storage:5 days 6. CO2 gas storage cylinder:to be used only once but can be replaced. 7. lighting up time by using batteries?? hours 8. air pressure in air cell??.2kg 9. dip angle of head and shoulders above the surface of water:30-40degree. 10. Freeboard(the distance between mouth and the surface of water): ??20mm 11. assembly with speaker for help and glisten shoulder mark with double tones?? 12.lifejackt light: lithium battery or water battery.