The Ambu patented hygienic system protects the student and makes internal cleaning entirely unnecessary. Look - Listen - Feel. Just as in real life, ventilation can be seen and exhalation through the nose and mouth can be felt and heard. Lightweight and sturdy, hence very easy to transport. Airways open only when head is correctly hyperextended. Stomach inflation indicated by a whistling sound. ACD CPR-compatible (optional ACD CPR base board). The manikin weighs 3.8 kg with and 2.7 kg without carry case. Total manikin length is 73 cm.