The HeartStart AED Trainer 2 looks just like the Philips HeartStart FR2+ AED. The optional remote control adds convenience and control over your practice scenarios! Uses 6 "C" size batteries (not included). Software is consistent with AHA G2010 Guidelines. The LED lights up automatically when pads are attached. If an electrode is loose or incorrectly placed on the manikin, the trainer will repeat the voice prompt to apply the electrode pads.