Features: 1. One-way valve with filter – fits in case while attached to the mask 2 .Easy way to secure to victim. 3. Affordable and practicle. 4 .The CPR Mask be packed in a Keychain bag. 5 .It is compacted in shape, can be placed into any first aid kit and carried easily. 6. It will low resistance unidirectional valve and water filter are combined to block fluid and secretions, valves and filters together played a barrier to rescue personnel and sick isolation. Material: PE CPR Mask Color: Transparent Bag Size: Approx. 1.97*1.97 inch / 5*5cm Mask Size: Approx. 11.02*7.08 inch / 28*18cm.