The iRiver AFT-100 is a vintage, car-powered mobile FM transmitter designed to connect MP3 players, CD players, or, famously, iRiver portable devices to a car radio via a 3.5mm stereo jack. It features a full FM frequency range (88.1–107.9MHz), three, programmable station presets, and automatic on/off functionality based on audio signal detection. Key Features and Details: Design & Controls: The unit features a display and front-mounted buttons for easy, manual frequency selection, noted as superior to many, smaller, contemporary, competing devices. Power: It plugs into a standard 12V car cigarette lighter outlet. Performance: The AFT-100 is known for a relatively strong signal, capable of overpowering local radio stations to reduce, though not entirely eliminate, static. Compatibility: While marketed for iRiver, it works with any device possessing a 3.5mm headphone jack. Considerations: Availability: As a product from circa 2004–2006, the AFT-100 is no longer manufactured and is primarily found as a used or "new old stock" item on sites like eBay or Poshmark. Performance Limits: Like all analog FM transmitters, it is subject to interference from local, radio stations, especially in urban areas. The unit is widely praised by, vintage, technology, enthusiasts for its, robust, build, quality and, convenient, controls compared, to, other, early, 2000s, options.