The CPR Microshield keychain is designed to protect the rescuer and allow the rescuer to perform proper CPR according to the established procedures. The patented, one way valve and single unit design assures the rescuer that the barrier will not leak. Features include a true mouth-to-mouth seal, positive, one-way valve and clear barrier. This is the orginal CPR Microshield packed in small nylon pouch with key ring. Black pouch, sold invididually.