If you are going to buy Toyota Prius 2011 or 2012 model, you will be prompted for level Two, Three Four and Five. Here are the differences between these levels.
The Prius Two is the entry level model available at $24,280 ( MSRP). It comes with Hybrid Synergy Drive with EV/ECO/Power Modes, Touch Tracer Display. The Smart Key System is available with Prius Two.
Prius Three ads JBL Audio System with Bluetooth and XM Satellite Radio. Available Options include Solar Roof, Available Voice-Activated navigation and XM NavTraffic.
Leather-trimmed seats and steering wheel, 3-door Smart Key System, Available Solar-Roof and Navigation
Upgraded wheels and headlamps - 17-in. 5-spoke alloy wheels, LED headlamps with auto level control, Integrated fog lamps, Available Advanced Technology Package
Source : 2012 Toyota Prius