Cardiopulmonary resuscitation (CPR) is a process used to resuscitate patients who can no longer breathe independently. Cardiac arrest, drownings, and automobile accidents are all common occurrences that possibly require CPR. However, manual CPR administers only 17% oxygen to the recipients, leaving patients at risk for hypoxia and potentially death. Majority of CPR devices on the current market use electronics. This leaves them susceptible to water damage due to harsh conditions in which they are used, such as beaches and swimming pools. ARBU 2.0 is a completely pneumatic CPR device that can deliver 100% oxygen without any adjustments, avoiding hypoxia and water damage. Different oxygen volumes are delivered depending on the four different breath profiles present: adult, child, infant, and a constant flow.