The CTS Standard comes with the four-cylinder engine, 17-inch alloy wheels, Brembo front brakes, heated exterior mirrors, automatic headlights, rear parking sensors, remote ignition, keyless ignition and entry, an auto-dimming rearview mirror, dual-zone automatic climate control, a manual tilt-and-telescoping leather-wrapped steering wheel with paddle shifters, eight-way power front seats (with two-way power lumbar), driver memory settings, leatherette (premium vinyl) upholstery and fixed rear seats with a trunk pass-through. Additional technology features include a 5.7-inch color display screen in the gauge cluster, OnStar telematics, 4G data connectivity with Wi-Fi capability, wireless charging, Bluetooth phone and audio connectivity, the base Cadillac User Experience (CUE) infotainment system (without navigation), an 8-inch touchscreen interface, voice controls and an 11-speaker Bose surround-sound audio system with three USB ports, an SD-card slot, an auxiliary audio jack, and satellite and HD radio. An optional Seating package includes upgraded exterior mirrors with driver-side auto-dimming, leather seating surfaces, heated and ventilated front seats, a split-folding rear seat, a power-adjustable heated steering wheel and additional LED interior ambient lighting. Both the CTS Standard and Luxury trim levels offer a panoramic sunroof, a navigation system and a 13-speaker Bose audio system as options. Standard safety features for the 2015 Cadillac CTS include antilock disc brakes, traction and stability control, active front head restraints, front and rear side airbags and full-length side curtain airbags.