General Specifications
Name/Model RR13 Hardware configuration Radio chip: SI4831, Analog audio chip: FIIO DDB AS100 custom chip
Color Retro gold/Black/Red/Silver Dimensions About 43.4x85.6x16.4mm
FM frequency FM1: 87~108MHz Weight About 76g
FM2: 76~90MHz Volume control Knob
Supported impedance 8~100Ω Antenna Built-in custom-shaped antenna + Detachable 3.5mm telescopic antenna
Status indicator light Stereo indicator light, Tuning indicator light, Battery life/Power off timer indicator light 　 　
Buttons and Ports
Switch Band/Mode selector switch*1, Output selector switch*1, BASS adjustment switch*1 USB port Type-C USB (charging port, analog-input)
Headphone output Standard 3.5mm port Knob Power on and off/Volume control knob, Tuning knob
Built-in speakers 8Ω 1W*2 　 　
Power Supply Parameters
Power supply DC 5V ≥ 2A Charging time About 2.5H
Battery Life and Test Conditions
Radio mode 3.5mm Headphone output: ≥7h
Audio input FM Load 32Ω
Volume level Default volume Playback track and format MP3 44.1KHz/16bit
BASS OFF 　 　
Speaker output: ≥4h
Audio input FM Load 8Ω
Volume level Default volume Playback track and format MP3 44.1KHz/16bit
BASS OFF 　 　
AMP mode 3.5mm Headphone output: ≥18h 
Audio input AMP Load 32Ω
Volume level Default volume Playback track and format MP3 44.1KHz/16bit
BASS OFF 　 　
AMP mode Speaker output: ≥4h 
Audio input AMP Load 8Ω
Volume level Default volume Playback track and format MP3 44.1KHz/16bit
BASS OFF 　 　
FM Radio Basic Specifications
FM Radio Performance and Parameters (3.5mm output)
Output level L+R≥390mVrms+390mVrms THD+N ＜0.25%
Noise-limited sensitivity ≤15dBuV (S/N=30dB) SNR ≥45dB (A-weighted)
FM Radio Performance and Parameters (Speaker output)
Output level L+R≥75mW+75mW (8Ω, THD+N＜1%, 780mVrms) Noise-limited sensitivity ≤15dBuV (S/N=30dB)
Headphone AMP Mode Performance and Parameters (3.5mm output)
Output power L+R≥65mW+65mW (16Ω, THD+N＜1%, 1Vrms) Output impedance ＜1Ω
L+R≥80mW+80mW (32Ω, THD+N＜1%, 1.6Vrms) Crosstalk ≥68dB
L+R≥10mW +10mW (300Ω, THD+N＜1%, 1.8Vrms） Input sensitivity 2.5V
THD+N ＜0.008% (1kHz/-0dBV@32Ω) SNR ≥100dB (A-weighted)
Frequency response 20Hz~95kHz: attenuation＜3dB Noise floor ＜10uV (A-weighted)
20Hz~20KHz: attenuation＜0.1dB Dynamic range ≥93dB (A-weighted)
Peak output voltage 4.5Vpp 　 　
Headphone AMP Mode Performance and Parameters (Speaker output)
Output power L+R≥75mW+75mW (8Ω, THD+N＜1%, 780mVrms) Frequency response 65Hz~20KHz