Features: 1. 1.3 ATA (4psi) operating pressure. 2. 2 zipper seal for easier entrance. 3. Large transparent viewing windows to prevent 4. Cotton chamber protection cover, to avoid dirty and easy to wash. 5. Emergency valve - To speed the depressurization in emergency. 6. User can observe the pressure while inside the chamber by internal pressure gauge 7. It can provide 93% oxygen from an oxygen headset/facial mask. 8. It is very easy for one people to operate without assistance.