Base V6 models start with 17-inch alloy wheels, xenon headlights, a limited-slip rear differential, keyless entry, integrated blind-spot mirrors, cruise control, air-conditioning, full power accessories, a tilt-only leather-wrapped steering wheel and a four-speaker sound system with a CD player and auxiliary audio jack. Stepping up to the V6 Premium adds upgraded 17-inch wheels, leather upholstery, a power driver seat, Bluetooth, Ford's Sync voice activation system, an auto-dimming rearview mirror, color-adjustable gauges and ambient lighting, a color information display between the gauges, upgraded interior trim and a premium eight-speaker sound system with satellite radio and an iPod/USB audio interface. Standard safety features for all 2014 Ford Mustangs include antilock disc brakes, front-seat side airbags (chest and head protection), traction control and stability control.