The Ambu has a squeezable bag, a one-way valve, and a face mask. Compressing the bag opens a valve, forcing air through a mask or artificial airway into the lungs, according to the journal "Critical Care Nurse." Releasing the bag closes the valve and exhalation occurs passively through the exhalation port. During exhalation, the bag automatically refills with room air or oxygen. The cycle continues until spontaneous breathing occurs or breathing is mechanically supported by a breathing machine.

手动人工呼吸器有特殊的纹理表面，以确保舒适和牢固的抓力，可长时间有效使用，而不会导致手疲劳。独特的的设计，体积小，容易握住。这种符合人体工程学的复苏袋设计轻便，使得用户使用更加舒适方便。