General Specifications
Name/Model BTR13 Hardware solution DAC: CS43131*2, USB/Bluetooth decoding: QCC5125
Color Black/Blue Volume control Physical button
Weight About 28.6g Dimensions About 63.2x30x18.8mm
Driver-free mode (switch mode) Supported Phone decoding (USB dongle) Supported (switch the Mode Switch to PHONE)
Microphone Supports Bluetooth voice call, built-in omnidirectional microphone In-vehicle mode Auto on/off following the USB of the vehicle
Gain L/H Channel balance <0.2dB
Deep standby Auto-enters power saving mode if no connection in 3 minutes, and the time can be set in the app. FiiO Control Supports settings in the app
Bluetooth codec indication Blue: SBC; Cyan: AAC; Purple: aptX/aptX LL; Yellow: aptX HD; White: LDAC; Green: aptX adaptive Status indication The display indicates transmission codec, charging status, battery level, volume, sampling rate, EQ, and menu
Display 0.96-inch TFT (80*160) bezel-less display Bluetooth reception (5.1) AAC/SBC/aptX/aptX LL/aptX Adaptive/aptX HD/LDAC
Recommended impedance PO: 8~150Ω Firmware upgrade OTA upgrade, through FiiO Control
BAL: 8~350Ω Max supported sampling rate PCM: up to 96kHz/16bit
Buttons and Ports
Physical button Power button*1; Multifunction button*1; Volume up/down button*1 USB TYPE-C USB (Charging/Data transmission)
Headphone output Standard 3.5mm plug Balanced headphone output Standard 4.4mm plug
Trigger switch Mode switch*1    
Power Supply Parameters
Power supply DC 5V /1A Battery capacity 460mAh lithium polymer battery
Charging time ≤2 hours    
Battery Life and Test Conditions
3.5mm headphone out: ≥8 hours
Audio input Bluetooth reception Bluetooth codec AAC
Volume 22 levels Gain High
Display status Off Play track and format MP3 44.1kHz/16bit
EQ Off Load 32Ω
4.4mm BAL headphone out: ≥8 hours
Audio input Bluetooth reception Bluetooth codec AAC
Volume 21 levels Gain High
Display status Off Play track and format MP3 44.1kHz/16bit
EQ Off Load 32Ω
3.5mm headphone out: ≥10 hours
Audio input USB dongle mode (switch the Mode Switch to PHONE) Gain High
Volume 22 levels Play track and format 44.1kHz/16bit
Display status Off Load 32Ω
EQ Off    
4.4mm BAL headphone out: ≥10 hours
Audio input USB dongle mode (switch the Mode Switch to PHONE) Gain High
Volume 21 levels Play track and format 44.1kHz/16bit
Display status Off Load 32Ω
EQ Off    
Audio Parameters
Parts of performance and parameters of headphone output (3.5mm, UAC decoding)
Output power L+R≥120mW+120mW (16Ω, THD+N<1%) Output impedance <0.6Ω
L+R≥100mW+100mW (32Ω, THD+N<1%) Crosstalk ≥75dB
L+R≥10mW +10mW (300Ω, THD+N<1%) Output amplitude 1.75Vrms
THD+N  <0.0018% (1kHz/-4dB@32Ω) SNR ≥125dB (A-weighted)
Frequency response 20Hz~40kHz: damping<3dB Noise floor <1uV (A-weighted)
20Hz~20klHz: damping<0.1dB
Parts of performance and parameters of BAL headphone output (4.4mm, UAC decoding)
Output power L+R≥130mW+130mW (16Ω, THD+N<1%) Output impedance <1Ω
L+R≥220mW+220mW (32Ω, THD+N<1%) Crosstalk ≥124dB
L+R≥55mW+55mW (300Ω, THD+N<1%) Output amplitude 2.7Vrms
THD+N  <0.0018% (1kHz/-6dB@32Ω) SNR ≥128dB (A-weighted)
Frequency response 20Hz~40kHz: damping<3dB Noise floor <1uV (A-weighted)
20Hz~20kHz: damping<0.1dB

BAL PO High Gain Output 2.3V@32Ω

PO High Gain Output 1.6V@32Ω  

Test conditions: USB DAC in, -5dB sinusoidal signal, 20Hz-20kHz, 3.5mm headphone out (32Ω load)

Test conditions: USB DAC in, -5dB sinusoidal signal, 20Hz-40kHz, 3.5mm headphone out (32Ω load)

Test conditions: USB DAC in, -5dB sinusoidal signal, 20Hz-20kHz, 4.4mm BAL headphone out (32Ω load)

Test conditions: USB DAC in, -5dB sinusoidal signal, 20Hz-40kHz, 4.4mm BAL headphone out (32Ω load)

Test conditions: USB DAC, -5dB sinusoidal signal, 20Hz-20kHz, PO (32Ω load)

Test conditions: USB DAC, -3dB sinusoidal signal, 20Hz-20kHz, 4.4mm BAL output (32Ω load)