The cprCUBE is a portable training device for learning hands-only cardiopulmonary resuscitation without the use of a training manikin. The red cube is made of a specially developed urethane foam with an elasticity that corresponds to that of the human rib cage. With the help of scenario cards, the user is guided through the different phases of resuscitation and receives direct feedback through light and sounds as to whether enough pressure is being exerted on the chest.