The Ambu Mark IV is available in two sizes: The Ambu Mark IV Adult designed for manual ventilation of adults and children with a body weight of down to approximately 15 kg (3 years), and the Ambu Mark IV Baby for infants and children with a body weight of up to about 20 kg (4-5 years). Features The unique Ambu double wall concept clearly distinguishes the genuine Ambu bag from all other manual resuscitators. It provides the "touch" Ambu bags are famous for. The thin outer cover gives the user a very good "fingertip" feeling for how much pressure is needed, while the inner lining with its air holes allows rapid recoil for optimum stroke volume. This gives you complete control of the amount of pressure delivered to the patient and enables artificial respiration with quick frequencies, if needed. Another unique effect of the Ambu double wall is that the elasticity of the outer cover limits airway pressure from exceeding approximately 7 kPa (70cm H20) during operation of the Ambu Mark IV Adult with one hand. Both Mark IV Adult and Baby are 100 % latex-free. The slim design and crystal clear casing housing the unique single-shutter valve allow unimpeded observation of the valve operation and make it easier to view and manage airflow to the patient. The Ambu Mark IV Baby is fitted with a pressure-limiting valve that opens when pressure in the valve reaches approximately 4.0 kPa (40 cm H2O). If more pressure is required, it can be easily overridden by pressing the attached override cap. The Ambu Mark IV Adult comes with an integrated handle making it easier to hold and enabling uniform compressions in all emergency situations, even in wet conditions - and for users with small hands. The Ambu Mark IV Baby resuscitator has an ergonomical design for optimal palm fit. You can hold it comfortably for long periods of time without hand fatigue. Both sizes feature a swivel between the patient valve and the mask, as well as between the valve and bag, making it possible to change positions or switch hands without interrupting patient ventilation.