Elysaid 100 Pcs/pack CPR Mask Keychain with Cpr Face Shield CPR Life Key for CPR Aed Training (Black) 100 Mini CPR Breathing Barrier Keychain Kits The item has a ventilation tube with 1-way valve. It is compacted in shape, can be placed into any first aid kit and carried easily. The CPR Mask be packed in a Keychain bag. The Face mask with Elastic earhook