The Physio Control Lifepak Express is an entry-level model with mid-level features. It offers ClearVoice technology, which allows rescuers to hear the clear and calm voice prompts in any type of environment. It also comes with Physio’s internal charge pack, which keeps the battery fully charged and ready to use. Physio Control devices use escalating energy, starting at 200 joules and going all the way up to 360 joules. You can even purchase optional pediatric pads if needed. In this case, entry-level still means feature-rich!