【Upgrade Your Old-fashioned Speaker System】Install this FiiO BR13 Bluetooth receiver to an older stereo receiver without Bluetooth, stream audio from your smart phone or tablet, listen to high-definition music wirelessly. | 【LDAC Hi-Res Audio】The BR13 Bluetooth audio adapter features the LDAC audio code. Comparable to CD-level sound | 【HiFi audio architecture】Featuring with ES9018K2M Reference DAC +the Qualcomm QCC5125 Bluetooth chip and TPA1882 op-amp - gives you the freedom to listen to high-quality audio whenever and however you want. | 【Versatile Interfaces】: including USB input, optical input, optical output, coaxial input/output, and RCA interface | 【Support the most powerful SPDIF conversion function】coaxial and optical fiber signals can be converted to each other, support BYPASS, and can also support coaxial and optical fiber input analog output. | Powerful app that supports more gameplay such as screen protection, sound adjustment, etc. It will also regularly receive OTA upgrades to unlock more fun features. | With 7 preset EQ options and 2 customizable ones, you can tailor your music to fit any genre or mood. Whether you're a fan of bass-heavy hip hop or prefer the crisp highs of classical music, our EQ adjustments have got you covered.