What is the difference in the PKG options?

I have now owned my 2007 Prius for 2 months, I bought it used. I brought it in for a checkup and was told it was a PKG 4.

I would like to know what is the difference between a pkg 2, 3, 4, 5 and 6?
I know that the tourning has a different suspension and tires.

 

I found the answer to the different options, I went and got a Toyota Hybrid Prius book at the dealership.

So if anyone else is interested in knowing the differences here they go.

Option 2:
Cruise control, heated outside mirrors, 15in 6 spoke alloy wheels with trim rings, tonneau cover and seatback pockets.
AM/FM cd with six speakers, auxilary audio jack and MP3/WMA playback capability.
Smart Key System
Backup Camera
Vehicle Stability Control (VSC)

Pkg #3
Same as above with these added on:
Anti theft system and auto dimming rearview mirror with Homelink universal transceiver
JBL am/fm 6 disc in dash cd changer with nine speakers in seven locations auxiliary audio jack, mp3/wma playback capability, satelite radio capability and hands free pone capability via Bluetooth technology

Pkg #4
Same as above with these added on:
High Intensity Discharge (HD) headlamps and intergrated fog lamps

Pkg #5
Same as above with these added on:
Voice activated DVD navigation system

Pkg #6
Same as above with these added on:
Leather trimmed seats and steering wheel

(Pkg's 3, 4, 5, 6, are have the JBL AM/FM 6 disc cd changer )