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2. FM transmitter (personal device) - Wikipedia

   en.wikipedia.org/wiki/FM_transmitter_(personal...

   A personal FM transmitter is a low-power FM radio transmitter that broadcasts a signal from a portable audio device (such as an MP3 player or a smartphone) to a standard FM radio. Most of these transmitters plug into the device's headphone jack and then broadcast the signal over an FM broadcast band frequency, so that it can be picked up by any ...

3. Traffic message channel - Wikipedia

   en.wikipedia.org/wiki/Traffic_message_channel

   Traffic Message Channel (TMC) is a technology for delivering traffic and travel information to motor vehicle drivers.It is digitally coded using the ALERT C or TPEG protocol into Radio Data System (RDS) [1] carried via conventional FM radio broadcasts.

4. Title 47 CFR Part 15 - Wikipedia

   en.wikipedia.org/wiki/Title_47_CFR_Part_15

   Variations on this type of transmitter were advertised for sale in radio magazines as far back as the 1920s. Walkie talkies intended for children's use, baby monitors, and some older cordless phones operate on frequencies in the 49 MHz band or at the upper end of the AM broadcast band. [citation needed]

5. Cassette tape adapter - Wikipedia

   en.wikipedia.org/wiki/Cassette_tape_adapter

   Another type of cassette adapter is the Bluetooth cassette adapter. It has the shape of a standard cassette, but has a built-in audio Bluetooth receiver module, a simple power supply to allow charging and power and a small battery. Usually, they may power on when the cassette player is set on play, and power off when the cassette player is stopped.

6. 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.

7. Bluetooth - Wikipedia

   en.wikipedia.org/wiki/Bluetooth

   It includes Classic Bluetooth, Bluetooth high speed and Bluetooth Low Energy (BLE) protocols. Bluetooth high speed is based on Wi-Fi, and Classic Bluetooth consists of legacy Bluetooth protocols. Bluetooth Low Energy, previously known as Wibree, [95] is a subset of Bluetooth v4.0 with an entirely new protocol stack for rapid build-up of simple ...