Specifications: This set is for the study of receiving and the transfusions of different blood groups. When we pressed the switch, if the blood group is transferable, light will appear along with the sound of the siren. The blood groups include Groups A, B, AB, and O respectively. The blood group of the receiver includes A, B, AB, and O respectively from left to right. The results are displayed in 9 sets of LED. The screen is covered with acrylic and is of size 33x30.5 cm.