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 Mk4 Adult with one hand.The slim design and crystal clear casing that houses the unique single-shutter valve allows unimpeded observation of the valve operation and makes it easier to view and manage airflow to the patient.The Ambu Mk4 BVM features 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.The Ambu Mk4 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.* As a reusable resuscitator the Ambu Mk4 IV can be autoclaved at a temperature of 134? Celsius* Made of silicone rubber, 100% latex-free* Bag volume: 1.3L* Dimensions: 27.5 x 13.5cm* Weight: 415g