It has a COMFORTzone Air Cell cushioning system which adjusts to provide a mix of shock absorption and support to suit each runner. The motor's capacity has been increased slightly as well, providing speeds of up to 12 mph at inclines of up to 12% for more difficult runs. Three backlit blue LCD screens display speed, option and history information, and 12 program options allow for the quick selection of settings. An MP3 player input is built in as well, allowing users to connect music to the treadmill and hear it through built-in speakers. A fan cools the user, allowing for longer and more strenuous workouts.