Change Modes with Just One Button

Due to the BTR15's ability to work as a Bluetooth receiver and as a USB DAC, we have implemented a PC/BT/PHONE mode button on it. With just a click of a button, you can quickly switch between the three different modes to match your current scenario for listening to high-quality music.

PC: Connect as a USB DAC, totally powered by the computer.

BT: Bluetooth DAC and amp, powered by the BTR15's internal battery, when connected via USR it can he charned.

PHONE: Connect to a phone as a USB DAC dongle, powered by the BTR15's internal battery.

Global Parametric EQ

Be the master of your music

The BTR15 features a global parametric equalizer (PEQ). Through FilO's self-developed PEQ algorithm and user interface, in any mode* you can choose the exact frequencies to be adjusted along with their gain levels and bandwidth - allowing you to fine-tune the sound to exactly the way you want it.

Dual-Core Upgrade

Two modes of high-res audio

The upgrades start from the heart of the BTR15, specifically the cores that power it. The BTR15 employs the high-performance combination of the Qualcomm QCC5125 Bluetooth chip = XMOS 16-core XU316 that supports stable high-res audio playback in any mode*, allowing you more ways to immerse yourself in the world of high-quality hi-res music.

MQA Full Decoder for Master-Quality Sound

The BTR15 supports MQA Full Decoder*, which means the MQA decoding can be achieved in any music app. This allows for high-resolution, master-level sound quality in reasonably sized files well-suited for your mobile device.

Dual Curved Glass

Dual upgrades to look and grip

With the BTR15, FIlO uses hot-bent curved glass for the first time - embedding it on both the front and the rear of the device. Not only does this make the device easier to hold, but it also gives the BTR15 a more attractive and 3D appearance. Together with the aluminum alloy middle frame, they make the BTR15 a comfortable device to handle - you won't be able to put it down once you pick it up.

0.96-Inch Oled Display

See all the info with just a glance

Like its bigger brother the BTR7, the BTR15 also features a large display - a brilliant 0.96-inch OLED display. This display not only allows displaying more information at once, it also allows for larger display fonts - making it easier for you to see the device status and change various settings. Moreover, it is the rarely seen device that supports bilingual languages, Chinese and English, among similar products.

Dual Outputs

Covering all angles

In addition to the standard 3.5mm single-ended headphone output, the BTR15 also comes with the widely-used 4.4mm balanced headphone output - featuring greater contact reliability and durability compared to the 2.5mm balanced out. The dual outputs ensure you can use the BTR15 with more headphones, for more remarkable listening expenences.

Independent Power Supply for Amp

Explosive power

Electricity is the mother of sound. Feiao engineers have carefully designed an independent power supply system for DAC ES9219MQ built-in earmuffs, so that earmuffs no longer share the power supply with DAC and the power supply is purer. In addition, the uniquely designed external power supply has the characteristics of low noise and high current, which increases the balanced output power of BTR15 by 40% to 340mW, and can easily meet the needs of portable use.

Parallel Output, More Power

You don't have to use the 4.4mm balanced output to enjoy the benefits of increased output power. In order to improve the performance of the BTR15 in every aspect, FIIO connected the headphone outputs in parallel to also greatly increase the output power of the 3.5mm single-ended output to better drive low-impedance headphones, allowing you to better unlock their potential.

Comprehensive Battery Protection

From worry to peace of mind

In order to alleviate concerns about battery health, FIIO engineers have implemented a number of software and hardware measures to comprehensively protect the BTR15's battery.

Specially Crafted Inside and Out

A joy to use

Aluminum Alloy Antenna

Wide directionality, stable signal

Smart App Connectivity

Supports app control, OTA updates

Included Transparent Clip

A stylish way to easily enable portable listening

Driver-Free Mode

Supports UAC1.0 mode, plug and play

Specifications:

General:

• Name/Model: BTR15
• Weight: About 37.3g
• MQA Renderer: Support
• Drive-free mode (switch mode): Support
• Microphone function: Support Bluetooth voice calls, built-in omnidirectional microphone
• Gain: L/H
• Bluetooth format indication: Support
• Deep Standby: Without any connection, it will automatically enter the power-saving shutdown in 2 minutes, and the time can be set by APP.
• Screen: 0.96 Inch OLED
• Maximum supported sampling rate:
• PCM: Support up to 384KHz/32bit
• DSD: Support up to DSD256
• Hardware Scheme: DAC: ES9219MQ * 2 ,USB: XMOS XU316, Bluetooth decoding: QCC5125
• Volume Control Type: Entity key
• Three circumference dimensions: Approximately 32.0x72.2x12.5mm
• Mobile phone decoding (small tail mode): Support (set the mode switch to the phone file)
• Car mode: Can follow the car USB automatic switch machine
• Channel Balance: <0.2dB
• FiiO Control: Supports APP settings
• Status Indication: Display indicates transmission format, charge, power, volume, sample rate, menu
• Bluetooth reception (5.1): AAC/SBC/aptX/aptX LL/aptX adaptive/aptX HD/LDAC
• Firmware Upgrade:
• Bluetooth firmware can be upgraded via OTA
• XMOS firmware can be upgraded via USB
• Impedance adaptation:
• PO:8~150Ω
• BAL:8~350Ω

Keys and Interfaces:

• Key: Power key * 1; Multi-function key * 1; Volume plus and minus key * 1
• Headphone output: Standard 3.5mm socket
• Toggle switch: Mode switch * 1
• USB: TYPE C USB2.0 (charging/data transfer)
• Balanced output: Standard 4.4mm socket

Power Parameters:

• Power supply: DC5V 1A
• Charging time: ≤ 2 Hours
• Battery Capacity: 550mAh Lithium polymer battery
• 3.5mm headphone output: ≥ 8 hours:
• Audio Input: Bluetooth reception
• Volume: Level 21
• Screen status: Close
• EQ: Close
• Encoding format: AAC
• Gain: High
• Playback tracks and formats: MP3 44.1KHz/16bit
• Load: 32 Ω
• 4.4mm Balanced output: ≥ 8 hours:
• Audio Input: Bluetooth reception
• Volume: Level 19
• Screen status: Close
• EQ: Close
• Encoding format: AAC
• Gain: High
• Playback tracks and formats: MP3 44.1KHz/16bit
• Load: 32 Ω

Audio Parameters:

• Headphone output part performance parameters (3.5mm,UAC decoding):
• Output power:
• L+R≥165mW+165mW (16Ω,THD+N<1%)
• L+R≥125mW+125mW (32Ω,THD+N<1%)
• L+R≥15mW +14mW(300Ω,THD+N<1%)
• Distortion plus noise: <0.0008%(1kHz/-8dB @ 32Ω)
• Frequency response:
• 20Hz ~ 50kHz: Attenuation <0.8dB
• 20Hz ~ 20KHz: Attenuation <0.1dB
• Output impedance: <1Ω
• Channel separation: ≥ 78dB
• Output amplitude: 2Vrms
• Signal-to-noise ratio: ≥ 120dB (A-weighted)
• Bottom noise: <2uV(A weight)
• Balanced headphone output part performance parameters (4.4mm,UAC decoding):
• Output power:
• L+R≥270mW+270mW(16Ω,THD+N<1%)
• L+R≥340mW+340mW(32Ω,THD+N<1%)
• L+R≥50mW+50mW(300Ω,THD+N<1%)
• Distortion plus noise: <0.0008%(1kHz/-6dB @ 32Ω)
• Frequency response:
• 20Hz ~ 50kHz: Attenuation <0.8dB
• 20Hz ~ 20KHz: Attenuation <0.1dB
• Output impedance: <1.5Ω
• Channel separation: ≥ 114dB
• Output amplitude: 3.2Vrms
• Signal-to-noise ratio: ≥ 122dB (A-weighted)
• Bottom noise: <2.7uV(A weight)