The first value displayed on the LCD will be the mode. While holding those 2 buttons down hit the power button to take you to the setup mode. Turn the machine on and press both the UP and DOWN buttons simultaneously for 3-5 seconds until the pressure LED light turns on. To reduce pressure, push the DOWN button; to increase pressure, press the UP button.
Then, firmly hold down both the ramp and power button while plugging the cord into the machine at the same time. Then plug the pronged end of the AC power cord into an electrical outlet that is not controlled by a wall switch. The self-inflating reservoir of the Ambu Bag, conceived by anesthesiologist Henning Ruben, M.D., revolutionized the process of manually administering respirations.