AED Trainer - Lifeline AEDThe 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.