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.