I2S amplifier MAX98357 is a high-efficiency Class D power amplifier 3.2W Class AB amplifier sound quality, I2S protocol, PCM encoding Master clock: no master clock (MCLK) required Plug and play: only a single power supply is needed to automatically configure 35 different clocks and 128 digital audio formats, 2.5V-5V DC power supply Suitable for Raspberry Pi, for Arduino and ESP32 and other microcontrollers or development board systems with I2S audio output Note: due to different production batches, the product appearance and printed words will be different, which will not affect the use. Output power: 3.2W at 4Q, THD 10% 1.8W at 8Q, THD 10% I2S sampling rate: 8kHz-96kHz Class D amplifier gain selectable: 3dB/6dB/9dB/12dB/15dB Colour:Blue Material:PCB Package Contents: 1 * Power Amplifier Module Kit 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.