CHAD Bonsai Velocity Pneumatic Oxygen Conserver Diathermy Deep Heat Units low resistance 416700 low resistance Directs those with impaired brain function away from doors and stairways Delivers a uniform oxygen pulse at increments: 1 2 3 4 5 and 6 * Two continuous flow (CF) settings preset @ 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 *