1. Using the mature and stable STM32F103 series 32-bit microcontroller, users can develop based on AT instructions or directly based on AIR780E; 2. Onboard AIR780E module, low power consumption, sleep power consumption as low as 600uA; 3. Flip-top nano SLM card holder, easy to load and unload; 4. Onboard blue AIR780E network status indicator; 5. Onboard reset button and user button, users can develop their own required functions; 6. Support Type-C power supply + KF128 terminal 5V power supply; 7. The commonly used IO ports of the microcontroller and AIR780E are basically all led out. Different batches may have different appearances, but will not affect the use Colour:Blue Material:PCB+Electronic component Package Contents: 1 x Relay Development Board 2 x Pin 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.