Featuring Real CPR Help (to guide users through CPR) and including rate and depth of chest compression, these AEDs can see what the user is doing and provide audio and text prompts. In addition, there is a visible bar gauge on their display screens for each compression in real time. And once installed, there is nothing to replace for five years from date of manufacturer—pads and batteries last that long. Units also have ingress protection ratings of IP55 for dust and water, enabling placement outdoors—near water and moisture—or in dusty environments. Powered by ten lithium batteries (included). They also come with CPR-D-pads and a carrying case. NOTE: Cannot ship to AK, HI, PR, or Catalina.