Car stereos play music from CDs, radios, and other media. They are usually installed in the car’s deck or dashboard and powered by the car batteries. Some models play only specific formats, while others have multiple slots for cassettes, CDs, and even memory cards and flash drives. Their primary component is the head unit, which holds all the playback controls and an LCD screen interface. They are usually part of an audio system, along with speaker sets, amplifiers, and crossovers.