Standard equipment on the S400 Hybrid, S550 and S550 4Matic includes 18-inch wheels, an adaptive air suspension, automatic wipers, a sunroof, automatic adaptive bi-xenon headlights, LED daytime running lights, adaptive high-beams, foglights, power-folding heated mirrors, a power rear sunshade and a power trunk lid. Inside the cabin, the S400 and S550 also feature a power tilt-and-telescoping steering wheel, dual-zone automatic climate control, auto-dimming rearview and driver-side mirrors, 14-way power-adjustable front seats, heated and ventilated front seats, front seat memory functions, leather upholstery and a wood-and-leather steering wheel. Also standard are voice control (for audio, phone and navigation), Bluetooth, a navigation system, the COMAND electronics interface and a 15-speaker Harman Kardon stereo with six-CD changer, auxiliary audio jack, an iPod interface, HD radio and satellite radio. Optional on the S400 and S550 is the Premium II package which adds upgraded front seats, keyless ignition/entry, front and rear parking sensors and a rearview camera. The 2011 Mercedes-Benz S-Class boasts an impressive list of safety features that includes antilock brakes, stability and traction control, front and rear side airbags and side curtain airbags.