3) What comes with the Kit?
The PC Interface Kit contains a DiabloSport approved DB9 to DB9 serial extension cable and a 12 Volt 1 Amp power supply.
If your PC has only USB connector (doesn't have a DB9 serial connector), you will have to purchase a commonly available Serial-to-USB adapter.
You can also use your own cable and/or power supply, or buy them from other sources. The cable is a standard (straight-through) serial cable, also called DB9 Male-Female cable or DB9 9-wire Serial Cable Extension. (Radio Shack part no: 26.117B)
If you want to power the Predator up at your desk, you will also need a 12 Volt (1 Amp minimum) power supply. The plug tip is 2.5mm x 5.5mm, female, and center is positive. (Radio Shack part no: 273-1776)
I went to Staples and bought a standard serial cable with one male and one female DB 9 pin connectors on each end for $7.98 plus tax. Walmart had a universal AC adapter that puts out 3-12 vDC at 1000mA for $15.94 plus tax.