The Standalone AED Trainer can be used to instruct students in the various operating modes of Defibtech DDU-100 Series AEDs, and in the use of an AED as part of a standard rescue protocol. The DDU-100TR is similar to a functional DDU-100 series AED in form and operation, but all rubberized exterior surfaces are red, instead of black, to clearly distinguish the unit as a training device that cannot be used to defibrillate a real patient.