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2. Land mobile radio system - Wikipedia

   en.wikipedia.org/wiki/Land_mobile_radio_system

   Land mobile radio systems use channels in the VHF or UHF bands, since the antennas used at these short wavelengths are small enough to mount on vehicles or handheld transceivers. Transmitter power is usually limited to a few watts, to provide a reliable working range on the order of 3 to 20 miles (4.8 to 32 km) depending on terrain.

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. Astro (Motorola) - Wikipedia

   en.wikipedia.org/wiki/Astro_(Motorola)

   They began testing of ASTRO portable radios, mobile radios, base stations, dispatch consoles, and a wide-area system in December 1992 for State Police Troop A, and completed a phased installation several years later. [8] This original ASTRO system was later converted to ASTRO 25. Today, ASTRO 25 is widely used for public safety communications. [9]

5. 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.

6. Mobile radio - Wikipedia

   en.wikipedia.org/wiki/Mobile_radio

   A bane of push-to-talk systems is the stuck microphone: A radio locked on transmit, which disrupts communications on a two-way radio system. One example of this problem occurred in a car with a concealed two-way radio installation where the microphone and coiled cord were hidden inside the glove box.

7. Alpine Electronics - Wikipedia

   en.wikipedia.org/wiki/Alpine_Electronics

   2008 - Introduction of the Imprint sound processor Technology, which allows individual car audio system tuning. 2008 - Introduction of the IVA-W205R Mobile Media Station, which can house a portable Blackbird Navigation device. 2009 - Introduction of head units which have integral bluetooth handsfree capability with an additional module.