95% Pure Supplemental Oxygen: Natural (no aroma) 5 liters. Approx. 100 one-second inhalations. Dimension: 2" x 2" x 8". Size: 3 ounces. As seen on SHARK TANK! Boost Oxygen is portable 95% pure supplemental oxygen for all-natural respiratory support. No prescription is needed. It is used by athletes for recovery, older adults for an active lifestyle, people at high altitudes for altitude acclimation and those experiencing poor air quality. Did you know the air we breathe contains only 21% oxygen – the majority is useless 78% nitrogen. Boost provides nearly 5x the pure oxygen you breathe normally. Boost Oxygen provides easy and immediate access to supplemental oxygen.