Drive Bonsai Velocity Pneumatic Oxygen Conserver includes a combination of a low- pressure regulator and an oxygen conserver Delivers up to a 6:1 savings ratio from 14 to 40 breaths per minute Deliver a uniform oxygen pulse at increments: 1, 2, 3, 4, 5, and 6 2 Continuous flow (CF) settings preset at 2 LPM and 4 LPM Operating pressure range: 200PSI to 3000PSI Senses a breath or delivers oxygen in the first half of the inspiratory cycle Lightweight, quiet operation and compact design