Onboard MicroSD card holder supports connecting an external SD card to store pictures or files. It provides flexible clock options, multiple power modes, and precise control, enabling multiscenario lowpower operation. Onboard memory includes 512KB ROM, 384KB ROM, 8MB PSRAM and 16MB Flash. Onboard 1.47inch LCD screen offers 172x320 resolution and 262K color. It provides access to most GPIO pins and includes an integrated fullspeed USB serial port. Equipped with a performance Xtensa 32bit LX7 dualcore processor, with main frequency up to 240MHz. It supports 2.4 GHz WiFi (802.11 b/g) and Bluetooth 5 (LE), with an onboard antenna. Use scenarios Field data collection and local storage: capture sensor data, store it on the SD card, and transmit when connectivity is available, using lowpower modes to extend battery life. Compact IoT display and control module: run a small user interface on the 1.47inch LCD, log status or images to the SD card, and communicate with other devices or a cloud service via WiFi or Bluetooth. Portable media and signage device: store pictures or media on the SD card, display on the builtin LCD, and connect to a computer or other devices through the USB serial port for configuration or data transfer.