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2. Vehicle audio - Wikipedia

   en.wikipedia.org/wiki/Vehicle_audio

   Some head units have built-in stereo amplifiers. Other car audio systems use a separate stand-alone amplifier. Every amplifier has a rated power level sometimes noted on the head unit with the built-in amplifier, or on the label of a stand-alone unit. Coaxial speakers: These are the most common type of car speakers and are often factory-installed.

3. In-car entertainment - Wikipedia

   en.wikipedia.org/wiki/In-car_entertainment

   Once controlled by simple dashboards knobs and dials, ICE systems can include steering wheel audio controls, handsfree voice control, touch-sensitive preset buttons, and even touch screens on higher-end units. [1] Latest models of In-car entertainment systems are coming equipped with rear-view cameras along with side cameras for better safety. [2]

4. Land mobile radio system - Wikipedia

   en.wikipedia.org/wiki/Land_mobile_radio_system

   A land mobile radio system (LMRS) is a person-to-person voice communication system consisting of two-way radio transceivers (an audio transmitter and receiver in one unit) which can be stationary (base station units), mobile (installed in vehicles), or portable (handheld transceivers e.g. "walkie-talkies").

5. Automotive head unit - Wikipedia

   en.wikipedia.org/wiki/Automotive_head_unit

   The head unit provides a user interface for the vehicle's information and entertainment media components: AM/FM radio, satellite radio, DVDs/CDs, cassette tapes (although these are now uncommon), USB MP3, dashcams, GPS navigation, Bluetooth, Wi-Fi, and sometimes vehicle systems status.

6. List of car audio manufacturers and brands - Wikipedia

   en.wikipedia.org/wiki/List_of_car_audio...

   This list of car audio manufacturers and brands comprises brand labels and manufacturers of both original equipment manufacturer (OEM) and after-market products generally related to in-car entertainment that already have articles within Wikipedia. While components sold by these companies have much in common with other audio applications or may ...

7. Bluetooth - Wikipedia

   en.wikipedia.org/wiki/Bluetooth

   Maximum power output from a Bluetooth radio is 100 mW for Class 1, 2.5 mW for Class 2, and 1 mW for Class 3 devices. Even the maximum power output of Class 1 is a lower level than the lowest-powered mobile phones. [164] UMTS and W-CDMA output 250 mW, GSM1800/1900 outputs 1000 mW, and GSM850/900 outputs 2000 mW.