This series adopts a discrete component configuration that separates the display section from the tuner section, and these two sections can be connected with a cable or by using an optional wireless video transmitter unit that employs AMIMON's WHDI technology.

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Qstarz appears to be one of the first companies to take this route, specifically by offering an MP3 player and FM transmitter as an option on its latest unit, the BT-Q920.

ENGADGET: BT-Q920 GPS receiver includes FM transmitter for over-the-air MP3s

Each onboard ADS-B set consists of a Global Positioning System satellite navigation unit, two Pentium microprocessors, some software and a radio transmitter-receiver--not much more gear than you would find behind the dash of a new Cadillac.

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The Recorder III is a hard drive-based unit that will supposedly sport Ethernet and possibly WLAN and an FM transmitter, like the 442v2.

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The device itself is a fairly standard affair, boasting a 4.3-inch WQVGA display, a 400MHz CPU, 64MB of RAM, an SD card slot, an FM transmitter, Bluetooth, and maps of the US and Canada pre-loaded on the unit's 2GB of internal flash memory -- an RDS-TMC traffic information receiver is also available as an optional accessory.

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Each contains a unit of the system, such as a microprocessor and memory, plus sensor or radio transmitter.

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Although the product's official page has no mention of MP3s nor a card slot to store them on, and the device itself seems extremely sparse on controls, PocketPCReviews claim to have a review unit on its way and they insist that it'll be able to play MP3s thanks to that transmitter.

ENGADGET: BT-Q920 GPS receiver includes FM transmitter for over-the-air MP3s