Featuring the PCM1794 DAC chip, dual op-amp (NE5532) dual-power-supply circuit architecture, and signal isolation for reduced system noise. This design eliminates pop/click sounds during power-on/off or cable insertion/removal, protecting connected speakers. Sound quality is rich and balanced, with tight bass, full mids, and smooth highs—achieved through both the 24-bit PCM1794 DAC and optimized analog circuitry. Built-in high-performance antenna ensures stable, reliable Bluetooth connectivity—comparable to traditional rod antennas. Uses a premium Bluetooth solution for fast pairing and strong connection stability. Rotary encoder for precise volume control and digital input source selection. Volume control is implemented at the analog stage to preserve audio fidelity—avoiding the signal degradation associated with digital volume adjustment. Volume step resolution is determined by the connected device’s (phone/computer) system settings. Dimensions: 12 cm × 12 cm × 2.5 cm Weight: 0.4 kg Power supply: 5 V / 2 A via USB-C Dynamic range: 110 dB Output level: 1.8 Vrms Output interface: 3.5 mm stereo jack Bluetooth: Supports AAC codec Audio inputs: USB, optical (TOSLINK), coaxial, and 3.5 mm analog (from computer or mobile device) USB audio support: WAV, FLAC, APE, and other lossless formats (16-bit/44.1 kHz, 1411.2 kbps) Also supports MP3 decoding (standard bitrates only; no encrypted or超高-bitrate files) Optical & coaxial inputs: Support up to 24-bit/96 kHz PCM audio