Fiio RR11 Retro Portable Stereo Radio FM/AMP dual modes/Aluminum body/Si4831 13mm ultra-thin aluminum body | Analog PVR tuning | Specialty FM radio chip Si4831 Ultra-wide FM band coverage | Specially designed circuit | BASS+3D sound effects FM/headphone amp dual modes Included retro-style earbuds | Included dongle Battery/power outlet dual power supplies | Retro lighting effects FiiO RR11 Radio General Specifications Hardware Configuration: Main Control: MS430F2121 Radio Tuner: SI4831 Analog Sound Effects Amplification: FIIO DDB AS100 Custom Chip Physical Dimensions: Size: Approximately 83.2 x 39.4 x 13 mm Weight: Approximately 46g Frequency Range: FM1: 87~108 MHz FM2: 76~90 MHz FM3: 64~87 MHz Volume Control Type: Rotary Knob Impedance Compatibility: 8~100? Status Indicators: Stereo Indicator Light Frequency Indicator Needle R adio Indicator Light Battery Level Indicator Light Antenna: Uses JF1 Headphone as Antenna USB Interface: Type-C USB (Charging Port, Analog Input) Headphone Output Interface: Standard 3.5mm Jack Knobs: Power On/Off Volume Adjustment Knob FM Tuning Knob Power Supply: Supports DC 5V/?1A Charging Time: Approximately 2 Hours FM Radio Performance Parameters: Output Amplitude: L+R ? 4mV + 4mV Total Harmonic Distortion + Noise: 0.3% Noise Limited Sensitivity: ? 15dBuV (S/N=30dB) Signal-to-Noise Ratio: ? 45dB (A-weighted) General Specifications Name/Model RR11 Hardware solution SoC: MS430, FM radio: SI4831, analog sound effect and amp: FIIO DDB AS100 custom chip Color Titanium gold/Black/Red/Silver Dimensions About 83.2x39.4x13mm Frequency Modulation (FM) FM1: 87~108MHz Weight About 46g FM2: 76~90MHz Volume control Volume knob FM3: 64~87MHz Adaptive impedance 8~100? Status indicator Stereo indicator, frequency pointer, radio indicator, battery level indicator Antenna Earphones JF1 work as an antenna Buttons and Ports Slide switch FM slide switch*1, Mode slide switch*1, Sound effect slide switch*1 USB port Type-C USB (charging port, analog input) Headphone output Standard 3.5mm port Knob Power on/off/Volume knob, FM knob Power Supply Parameters Power supply DC 5V/?1A Charging time About 2h Battery Life and Test Conditions FM mode 3.5mm headphone out: ?8.5h Audio input FM Load 32? Volume level 40mV out Play track and format MP3 44.1kHz/16bit AMP mode 3.5mmheadphone out: ?17.5h Audio input AMP Load 32? Volume level 40mV out Play track and format MP3 44.1kHz/16bit Basic Parameters Performance and parameters of FM mode Output amplitude L+R?4mV+4mV THD+N ?0.3% Noise-limited sensitivity ?15dBuV (S/N=30dB ) SNR ?45dB (A-weighted) Performance and parameters of AMP mode (3.5mm out) Output power L+R?30mW+30mW (16?, THD+N?1%) Output impedance ?1? L+R?40mW+40mW (32?, THD+N?1%) Crosstalk ?65dB L+R?5mW +5mW (300?, THD+N?1%) Output amplitude 1.1Vrms THD+N ?0.04% (1kHz/-24dB@32?) SNR ?100dB (A-weighted) Frequency response 20Hz~95kHz: attenuation?3dB Noise floor ?10uV (A-weighted) 20Hz~20kHz: attenuation?0.1dB Peak output voltage 3Vpp Input sensitivity 0.9V ? ?