Onboard microSD card holder that can be connected to an external SD card to store pictures or files. It supports flexible clock settings, multiple power modes, and accurate control to enable multiscenario lowpower operation. Memory and storage: onboard 512 KB ROM and 384 KB ROM, 8 MB PSRAM, and 16 MB Flash. Onboard 1.47inch LCD screen with 172x320 resolution and 262K color. Provides access to the majority of GPIO pins and includes an integrated fullspeed USB serial port. Processing and wireless: performance Xtensa 32bit LX7 dualcore processor with main frequency up to 240 MHz. Supports 2.4 GHz WiFi (802.11 b/g) and Bluetooth 5 (LE) with an onboard antenna. Practical use scenarios: Field data logging and sensor gateway: store data locally on the SD card, run lowpower modes to extend battery life, and wirelessly transmit or batch data when needed. Edge computing and smartdevice controller: process data ondevice, use the LCD for status and control, and connect sensors via GPIO while communicating over WiFi or Bluetooth. Portable development and demonstration device: use the builtin USB serial port for debugging, the LCD for UI, SD storage for assets and logs, and wireless connectivity for testing network features.