The FiiO RR11 is a portable HiFi FM stereo radio receiver that combines analog tuning precision with modern audio technology. Measuring 83.2 mm x 39.4 mm x 13 mm, this compact device features an aluminum alloy housing with PVR analog tuning, providing instant tactile feedback and setting it apart from digital alternatives. Certified for Hi-Res audio, it operates in the FM band from 64 MHz to 108 MHz and captures standard broadcasts as well as campus radio stations with enhanced clarity and stability, thanks to the Silicon Labs Si4831 professional FM chip. The RR11 includes both headphone antenna functionality and a powerful PCB signal amplification antenna for reliable reception in various environments. It comes with custom retro earbuds and a digital-to-analog conversion cable that transforms the device into a compact headphone amplifier when connected. This amplification boosts output power and utilizes the DDB analog sound effect chip to deliver BASS+ and 3D sound enhancements, creating an immersive listening experience for music and radio content. The red color option and retro-modern aesthetic design make it both functional and visually appealing for portable audio enthusiasts seeking high-quality radio reception and audio performance in a lightweight, easily transportable format.