This is a pocket mouth to mouth Cpr products, you can hang on your key ring, it is very compact and convenient. When someone needs CPR, you can find it right away. It is a one-way channel, CPR not as infectious diseases. It comes with flexible earloop CPR Barrier, operate more convenient. It is widely used in CPR training and AED training courses. for students, it is what a good gift. Material： Nylon Pouch, PE Face Shield. Size: Pouch 2"x 2" , Face Shield 8 1/4 " x 7 3/4" ;