Brand new, but has small crack on corner of glass. Please look carefully before purchasing. 1. Balanced and SE output: Truly balanced design with better measurements and better actual sound. 2. Strong decoding: Flagship Qualcomm CSR8675. 3. Lossless support: Bluetooth 5.0，supports LDAC/aptX HD and other lossless formats. 4. Improved measurements: 2x high-performance AK4377A DACs 5. Precise signal reproduction: dual 22.5792M/24.576M crystal design. 6. Double-sided 2.5D glass:aluminum alloy body + double-sided glass. 7.Helps with computer audio: Driverless, plug-and-play USB DAC. 8.RGB light indicator: quickly identifies Bluetooth format. 9.Precise volume control: Volume control independent from device 10. Extended functionality from app: channel balance, audio filters, EQ