Main chip: PCM2704 USB DAC chip. It features a built-in USB interface controller and two-channel digital-to-analog conversion. Compliant with USB 1.1 standard. Supports sampling rates of 32 kHz, 44.1 kHz, and 48 kHz at 16-bit resolution. Includes integrated volume control and mute function, synchronized with the computer. USB-powered — connects directly to any USB port; no external power adapter required. Analog output can be connected directly to headphones or line-level audio inputs. Also provides S/PDIF digital output for connection to external DACs or receivers. Specifications: - Dynamic range / Signal-to-noise ratio: 98 dB - Total harmonic distortion + noise (THD+N): 0.006% (load = 10 kΩ), 0.025% (load = 32 Ω) - Headphone output power: 12 mW (32 Ω load) - Operating voltage: 5 V (via USB) - Dimensions: 55 × 50 mm - Housing material: PC (polycarbonate) - Color: As shown in product images Compatibility: - Windows XP, Windows 7, Windows 2000: plug-and-play (no driver required) - Windows 98SE: driver installation required Package includes: - 1 × PCM2704 USB Audio Decoding Module Note: Actual product color may vary slightly due to lighting conditions and screen settings. Dimensions are subject to a tolerance of ±1–3 cm.