The Bonsai Velocity is the most efficient pneumatic conserver on the market, enjoying more liter flow equivalencies, continuous flow settings, and a higher savings ratio than the competition. The Bonsai Velocity's decreased delivery time increases oxygen concentration provided to the patient, thus increases the ability to better maintain patient saturation levels, all while maintaining up to a 6:1 conservation ratio. The Bonsai Velocity delivers a uniform oxygen pulse which ensures that if you breathe faster, you will still receive the same amount of oxygen; unlike other products on the market. Delivers a uniform oxygen pulse at increments: 1, 2, 3, 4, 5 and 6|Two continuous flow (CF) settings preset at 2 LPM and 4 LPM|Delivers up to a 6:1 savings ratio from 14-40 breaths per minute|Senses a breath/delivers oxygen in the first half of the inspiratory cycle|Operating pressure range: 200-3000 PSI|Light weight and quiet operation|Easy to operate single selector knob|Compact design fits easily in virtually any oxygen carry bag