1. Based on the 40-pin GPIO interface of Raspberry Pi, suitable for Raspberry Pi series motherboards
2. Utilizing the DA7212 professional stereo codec chip, controlled via I2C interface and transmitting audio through I2S interface
3. Built-in standard 3.5mm headphone jack, allowing music playback through an external headphone
4. Built-in AUX input interface, facilitating the expansion connection of other devices
5. Built-in speaker terminals and PH2.0 dual-channel speaker interface, supporting multiple types of interfaces for more versatile usage scenarios
6. Built-in dual microphones, enabling recording without the need for additional device connections
7. Built-in custom function keys and custom function indicator lights
8. Supports the highest sampling frequency of 96KHz
9. Supports the highest resolution of 24-bit

Parameters
1. Audio codec chip: DA7212
2. Supply voltage: 5V
3. Logic voltage: 3.3V
4. Control interface: I2C
5. Audio interface: I2S
6. DAC signal-to-noise ratio: 100dB
7. ADC signal-to-noise ratio: 90dB
8. Headphone driver: 160mW (16 ohms, 5V)
9. Speaker driver: 2.6W per channel (4 ohms, BTL)