The only AED with CPR feedback and an ECG waveform. By supporting CPR as well as defibrillation, this device can help every unresponsive victim. Features Real CPR Help®, a tool that is able to actually see what user is doing and provides audio and visual prompts to help them do it with confidence and clarity. Provides a one-piece electrode for accurate placement. Uses consumer lithium batteries that are easy to replace, long-lasting, and inexpensive.