O2 Blast Oxygen Supplement, Quick Recovery 4 Liter Can

99.7% Pure Oxygen Supplement, Quick Recovery 4 Liter Can. Toss it in your gym bag or a hiking backpack for adjusting to altitude, performance and recovery for active individual and team sports like hockey, football, biking or basketball. Each 50 breath can delivers 99.7% oxygen to your lungs. POINT IN TO MOUTH AND PRESS BUTTON, INHALE DEEPLY.... HOLD AND EXHALE. Inhale 3 to 5 breaths — or as much as you need — for energy and recovery. Portable oxygen is well known to restore your oxygen levels at high altitudes, but O2 BLAST can be helpful for any active, daily task.