The PCB uses a double-layer immersion gold process design to ensure excellent performance for both high and low currents. High-quality active crystal oscillator. Features a proprietary developed program, providing complete optimization of the decoding chip, resulting in better signal integrity and less signal distortion. Uses a dual operational amplifier, with the operational amplifier powered by positive and negative power supplies. The ES9039Q2M's MCLK uses an independent 49.152MHz clock, so only DATA, BCK, LRCK, and GND inputs are required. Supported PCM Sampling Rates: 16/24/32 bit at 44.1/48/88.2/96/176.4/192/352.8/384/768 kHz Supported DSD Rates: 64/128/256/512/1024 Power Input: DC port DC 5V-9V, or silk screen 5V Signal Input: I2S Output: 3.5mm headphone jack Size: 30mm x 68.5mm MCLK of ES9039Q2M: Independent 49.152MHz clock Inputs: DATA BCK LRCK GND (The product printed words may vary depending on the batch, but this does not affect use) Color: As Shown Material: PCB Package Contents: 1*ES9039Q2M Decoding Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.