0.96 inch 128X64 OLED display can be used to display debugging information, battery power, and other information. Type-C USB interface with voltage regulator, ESD protection, short circuit protection, RF shielding, and other protection measures. SH1.25-2 battery interface, integrated lithium battery management system (charge and discharge management, overcharge protection, battery power detection, USB / battery power automatic switching). Integrated CP2102 USB to serial port chip, convenient for program downloading, and debugging information printing. It is the best option for smart cities, farms, homes, industrial control, house security, wireless meter reading, and IoT developers.