Due to the BTR15’s ability to work as a Bluetooth receiver and as a USB DAC, the BTR15 features a PC/BT/PHONE mode button. 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 USB, it can be charged.
• Phone: Connect to a phone as a USB DAC dongle, powered by the BTR15’s internal battery.

The BTR15 features a global parametric equalizer (PEQ). Through FIIO’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.  

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, allowing you more ways to immerse yourself in the world of high-quality hi-res music.

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.

In addition to the standard 3.5mm single-ended headphone output, the BTR15 also comes with the widely-used 4.4mm balanced headphone output. 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.

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.

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.