This has to do with the drivetrain of the car. In simpler terms, the power delivery system of the car. A 2wd or a two wheel drive is any general stick shift(manual transmission) car you drive. Either the front two rotates and pull your car or the back two rotates and push your car forward. For a 4wd or a four wheel drive, you can switch to all of the wheels being driven. Provides better grip on the road.
How the system works. Active Noise Cancellation (ANC) is designed to dramatically reduce low frequency noise in the interior. The system operates whenever the car is running, regardless of whether the audio system is on or off. There are two microphones in the cabin area.
How Does Active Release Techniques Work? Active Release Techniques is a treatment that begins with an ART provider feeling the affected area for the telltale soft-tissue adhesions that can be felt by hand. Once the cause of the pain is located, the provider does a series of treatments similar to deep-tissue massage in order to break up the scar tissue and free up the body to work as it naturally should.