The base H3 and H3X are powered by a 242-hp 3.7-liter inline five-cylinder engine bolted to a standard 5-speed manual or optional 4-speed automatic transmission (standard on H3X and H3 Alpha). The H3 Alpha features a 300-hp 5.3-liter V8 power for increased towing capacity and quicker acceleration, as well as heated leather power seats, Monsoon sound system and chrome exterior trim. The H3X includes a body color grille, chrome brush guard, 18-inch chrome wheels, heated leather power seats, Monsoon sound system, and chrome exterior trim. Standard safety features include: anti-lock brakes, stability and traction control, frontal and curtain side-impact airbags, OnStar and a tire-pressure monitoring system. For 2009, the HUMMER H3 adds Bluetooth wireless connectivity and hill start assist as standard equipment on all trims.