Features: External High-gain BT Antenna ensures the lossless and stable signal transmission. Support PC USB DAC, plug and play, very convenient to use. Adopt the QCC3008 BT chip, Support BT 5.0 which can ensure fast and stable transmission. Adopt high performance ES9018K2M DAC decoder chip, ensures high S/N and very low distortion. Support the high-definition format of aptX; Have high-quality optical fiber and coaxial digital output interface. Specification: Brand Name: XDUOO Model: XQ-50  BT Version: V5.0 BT Audio Coding: SBC, AAC, apt-X THD+N: Optical fiber: 0.00087% Coaxial output: 0.00087% AUX output: 0.07% Power input: DC 5V/1A Main Item Size: 9.7 * 7.5 * 3cm / 3.82 * 2.95 * 1.18in Main Item Weight: 162g / 5.71oz Package Size: 21 * 13 * 5.5cm / 8.27 * 5.12 * 2.17in Package Weight: 294g / 10.37oz Package List: 1 * BT Audio Receiver Converter 1 * USB to TYPE-C Cable 1 * BT Antenna 1 * User Manual