The MX series acts as a digital baybus and allows you to plug fans and temperature probes directly into the unit. You can also plug in the Indicator to light up LEDs. With the MX2 series you can now monitor CPU statistics, Hard drive space, and other system critical information. The MX2 also allows you to plug 3 fans and 4 temperature probes directly into the back of the unit for all you quiet and cooling PC needs. Includes everything you will need to get going.