Feature: 1.The item has a ventilation tube with 1-way valve. 2.It is compacted in shape, can be placed into any first aid kit and carried easily. 3.The CPR Mask be packed in a Keychain bag. 4.Affordable and practicle. 5.It is compacted in shape, can be placed into any first aid kit and carried easily. It will low resistance unidirectional valve and water filter are combined to block fluid and secretions, valves and filters together 6.played a barrier to rescue personnel and sick isolation. Specification: 1.Keychain Bag Color：yellow blue 2.CPR Mask Color: Transparent 3.Material：Nylon Pouch, Polyethylene Face Shield 4.Bag Size: Approx. 1.97*1.97 inch / 5*5cm 5.Mask Size: Approx. 11.02*7.08 inch / 28*18cm Package contents：2 pcs.