Base M5GO Bottom3 is an expansion base specially designed for the CoreS3 series products, integrating an IR LED emitter and a 500mAh lithium battery. Two groups of HY2.0-4P expansion interfaces have led out commonly used ADC/DAC/UART pins, which can be used for connecting various types of sensors. There are 10 programmable RGB lights (WS2812) on each side of the base. With the frosted light-transmitting material light-shielding strip, it can provide a soft and comfortable lighting effect. The bottom is equipped with a pogo pin magnetic charging interface. When the charging base is adsorbed, the current will flow safely into the internal battery through the built-in TP4057 charging chip. In addition to the charging function, the pogo pin interface has led out the main control I2C bus, enabling users to externally expand through magnetic adsorption. There is a built-in adsorption magnet, and the back adopts a design compatible with LEGO holes, which can be seamlessly connected with LEGO structural designs.