The Defibtech Lifeline VIEW, ECG, & PRO models have more detailed voice prompts including CPR coaching, full text prompting, a smaller, single battery pack, and, of course, the video screen no one else has! Now with a full 8-year factory warranty. As the loud-and-clear voice prompts guide you through the rescue sequence, the full-color video screen "walks" you by visually showing video snippets of each step. If there's ever a doubt, simply watch the example on the 3" x 2.25" video screen. They're built to the same rugged military drop, vibration, and shock specifications of all previous Defibtech models. They also have a high "IP Rating" of 55. The number translates to extreme resistance to dust and moisture.