One of the famous celebrity senators used the vehicle for a campaign for greener environment because of its plug-in hybrid feature that was developed intentionally for HUMMER. The HUMMER H3 is a Sports Utility Vehicle manufactured by General Motors division, which was produced in 2005. It is the very smallest among the Hummers (especially if it comes to Hummer H3T) and only has been built by GM. It has 3.5 L straight five cylinders L52 engine that can produce 220hp. Its transmission has been replaced from time to time to reach the maximum sustained level of its efficiency. Its capacity to drive for a two-speed, electronically controlled full-time 4 wheel drive can negotiate the grades of 60% slopes and side slopes of 40%. It was originally developed as two door cab, but eventually conceptualized as four door cab after the auto show in 2008.