Fangrui Product Details 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 , For 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 Be Different, Which Not Affect The Use. Output Power: 3.2w At 4q, 1.8w At 8q, 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.