The xB is powered by a 158-hp 2.4-liter four-cylinder engine, mated to a five-speed manual transmission. A four-speed automatic transmission with manual shift mode is optional, and both gearboxes are controlled through a high-mounted shifter, which falls easily into the driver's hand. Every xB is equipped with 16-inch wheels, air conditioning, power mirrors and windows, power door locks with remote keyless entry, a satellite-compatible 160-watt Pioneer audio system with MP3 capability, an auxiliary audio input jack for portable music devices and USB connectivity; a rear liftgate provides access to a generous cargo area with approximately 70 cubic feet of capacity. Safety features include a vehicle stability control system with traction control, four-wheel anti-lock disc brakes with brake assist, a tire pressure monitor, and dual front, front side-impact and overhead curtain airbags. The Scion xB is restyled for 2011, with a more aggressive exterior and additional comfort and convenience features. On the outside, the bumpers, grille, headlights and taillights have all been revised, while interior changes include a new center console with sliding armrest, a tilt/telescopic steering wheel and upgraded seating, with larger front bolsters and a new geometric pattern for the fabric.