1.the mask is small in size and can be carried around in a pocket. It is a widely used CPR breathing mask. It combines a low-resistance one-way valve and a waterproof filter to block liquids and secretions. the valve and filter together act as a barrier to isolate rescuers from the sick. 2.Mutifuntion Tool: It is both an CPR face shields and a key Chain kit that can easy to use 3.Can be put into any first aid kit for its compacted shape. Great for glove compartment, boat, purse, keychain or home.