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BLOOD RING is a new testing hand ring. When accident happens, the patients will be taken to hospital and will be given a hand ring to identify themselves. Therefore, with this new design, the doctor can know patient’s blood type in advance by giving the BLOOD RING to patient during the ambulance transporting. When the BLOOD RING contacts with the patient’s blood, it will show the blood type. It can help the hospital prepare earlier in case the patient needs lots of blood.