General Specifications
Name/Model BTR17 Hardware solution DAC: ES9069Q*2, USB DAC: XMOS XU316*1, Bluetooth: QCC5181
Color Black/Blue Volume control Physical volume knob
Weight About 73.4g Dimensions About 16.3×41.2×86.6mm
Driver-free mode (switch mode) Supported Desktop mode Supported
MQA  MQA full decoding Channel balance ＜0.2dB
Gain L/H Status indication Displays Bluetooth codec, volume level, gain, USB mode, sampling rate, etc.
Display 1.3-inch color IPS display Firmware upgrade Bluetooth firmware supports OTA upgrade
Bluetooth reception (5.4) AAC/SBC/aptX/aptX Adaptive/aptX Lossless/aptX HD/LDAC XMOS/System firmware supports upgrade through USB
Max supported sampling rate PCM: Up to 768kHz/32bit Adaptive impedance PO: 8~150Ω
DSD: Up to DSD512 (Native), DOP256 BAL: 8~300Ω
Bluetooth codec indication (light color indicator and characters on display Blue: SBC; Cyan: AAC; Purple: aptX; Yellow: aptX HD; White: LDAC; Green: aptX Adaptive/aptX Lossless FIIO Control Supports settings through app
In-vehicle mode Automatically turn on/off with the vehicle's USB
Deep standby Without any connection, it automatically enters power saving shutdown state in 3 minutes, and the timer can be set in the app Microphone function Supports Bluetooth voice call, built-in omnidirectional+CTIA in-line control mic
Buttons and Ports
Button Power on/off*1; Previous track*1; Next track*1; Volume knob (with confirm)*1 USB Type-C USB (Power supply/Data transfer)/Type-C  USB POWER IN (Orange, Power supply)
Headphone out Standard 3.5mm port Balanced headphone out Standard 4.4mm port
Slide switch Mode switch (PC/BT/PHONE)*1; Desktop mode switch*1    
Power Supply Parameters
Power supply DC 5V ≥2A Charging time ≤2h
Battery Life and Test Conditions
3.5mm headphone out: ≥9h
Audio input Bluetooth receiving Bluetooth codec AAC
Volume level 23 level Gain High
Display status Off Playing track and format MP3 44.1KHz/16bit
EQ Off Load 32Ω
4.4mm balanced headphone out: ≥8h
Audio input Bluetooth receiving Bluetooth codec AAC
Volume level 18 level Gain High
Display status Off Playing track and format MP3 44.1KHz/16bit
EQ Off Load 32Ω
3.5mm headphone out: ≥10h
Audio input Phone mode (slide the mode switch to PHONE position) Gain High
Volume level 23 level Playing track and format 44.1KHz/16bit
Display status Off Load 32Ω
EQ Off    
4.4mm balanced headphone out: ≥9h
Audio input Phone mode (slide the mode switch to PHONE position) Gain High
Volume level 18 level Playing track and format 44.1KHz/16bit
Display status Off Load 32Ω
EQ Off    
Audio Parameters
Performance and parameters of headphone output (3.5mm, UAC decoding, Desktop mode: High gain)
Output power L+R≥330mW+330mW (16Ω, THD+N＜1%) Output impedance ＜1Ω
L+R≥280mW+280mW (32Ω, THD+N＜1%) Crosstalk ≥78dB
L+R≥30mW +30mW (300Ω, THD+N＜1%) Peak output voltage 8.5Vp-p
THD+N ＜0.0015% (1kHz/-18dB@32Ω) SNR ≥120dB (A-weighted)
Frequency response 20Hz~80kHz: attenuation＜3dB Noise floor ＜3uV (A-weighted)
20Hz~20KHz: attenuation＜0.1dB
Performance and parameters of balanced headphone output (4.4mm, UAC decoding, Desktop mode: High gain)
Output power L+R≥480mW+480mW (16Ω, THD+N＜1%) Output impedance ＜1.5Ω
L+R≥650mW+650mW (32Ω, THD+N＜1%) Crosstalk ≥120dB
L+R≥125mW+125mW (300Ω, THD+N＜1%) Peak output voltage 17.5Vp-p
THD+N ＜0.00035% (1kHz/-10dB@32Ω) SNR ≥126dB (A-weighted)
Frequency response 20Hz~80kHz: attenuation＜3dB Noise floor ＜2.2uV (A-weighted)
20Hz~20KHz: attenuation＜0.1dB
Performance and parameters of headphone output (3.5mm, UAC decoding, non-Desktop mode: High gain)
Output power L+R≥130mW+130mW (16Ω, THD+N＜1%) Output impedance ＜1Ω
L+R≥140mW+140mW (32Ω, THD+N＜1%) Crosstalk ≥78dB
L+R≥20mW +20mW (300Ω, THD+N＜1%) Peak output voltage 6.5Vp-p
THD+N ＜0.0022% (1kHz/-12dB@32Ω) SNR ≥120dB (A-weighted)
Frequency response 20Hz~80kHz: attenuation＜3dB Noise floor ＜2.1uV (A-weighted)
20Hz~20KHz: attenuation＜0.1dB
Performance and parameters of balanced headphone output (4.4mm, UAC decoding, non-Desktop mode: High gain)
Output power L+R≥180mW+180mW (16Ω, THD+N＜1%) Output impedance ＜1.5Ω
L+R≥300mW+300mW (32Ω, THD+N＜1%) Crosstalk ≥105dB
L+R≥35mW+35mW (300Ω, THD+N＜1%) Peak output voltage 9.3Vp-p
THD+N ＜0.0008% (1kHz/-4dB@32Ω) SNR ≥122dB (A-weighted)
Frequency response 20Hz~80kHz: attenuation＜3dB Noise floor ＜2.3uV (A-weighted)
20Hz~20KHz: attenuation＜0.1dB

BAL Desktop mode high gain output 4V@32Ω 

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

Test conditions: USB DAC in, -5dB sinusoidal signal, 20Hz-80kHz, Desktop mode high gain, 3.5mm headphone out (32Ω load)

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

Test conditions: USB DAC in, -5dB sinusoidal signal, 20Hz-80kHz, High gain, 3.5mm headphone out (32Ω load)

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

Test conditions: USB DAC in, -5dB sinusoidal signal, 20Hz-80kHz, Desktop mode high gain, 4.4mm balanced headphone out (32Ω load)

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

Test conditions: USB DAC in, -5dB sinusoidal signal, 20Hz-80kHz, High gain, 4.4mm balanced headphone out (32Ω load)

Test conditions: USB DAC, -18dB sinusoidal signal plackback, 20Hz-20kHz, Desktop mode high gain, PO (32Ω load)

Test conditions: USB DAC, -12dB sinusoidal signal plackback, 20Hz-20kHz, High gain, PO (32Ω load)

Test conditions: USB DAC, -10dB sinusoidal signal plackback, 20Hz-20kHz, Desktop mode high gain, 4.4mm balanced headphone out (32Ω load)

Test conditions: USB DAC, -4dB sinusoidal signal plackback, 20Hz-20kHz, High gain, 4.4mm balanced headphone out (32Ω load)