Power supply voltage: DC 5V–10V (e.g., VCC to 5–10V, GND to GND). Do not reverse-connect the power supply, as this may damage the board. Voltage exceeding 10V may also cause damage. In addition to VCC and GND connections to the power supply, the remaining pins—GND, LRCK, DATA, and BCK—are connected to the I2S signal input. This board does not require an external MCLK signal, as it uses an asynchronous clock architecture. The internal PLL is used only for generating the internal MCLK clock and does not increase the audio sampling rate. Supports direct input of I2S format and left-justified signals (manual switching required). Supports up to 32-bit data and 384 kHz sampling rate. Signal-to-noise ratio: 112 dB. Total harmonic distortion: –93 dB. Direct output: 2.1 V RMS audio voltage. High-frequency response is clean; low-frequency response is full and deep. Features ES9023 DAC. Material: PCB Package contents: 1 × Decoder board only. Other accessories are not included. Note: Color appearance may vary slightly due to lighting conditions and display settings. Measurement tolerance: ±1–3 cm.