1. Onboard and stable ESP32-WROOM-32E module with 4MB Flash 2. All I/O ports and UART programming download ports of the ESP32 module are broken out for easy secondary development 3. Integrated DC-12V to 3.3V power supply circuit; supports DC-12V power input 4. Features onboard reset button and IO0 programmable button 5. ESP32 supports IDE compilation tools and provides reference programs for development environment. Includes 16 relay channels that output switching signals, suitable for controlling loads within AC250V/DC30V operating voltage Model: ESP32 16 Channel Relay Module Note: Product appearance, color, and printed markings may vary between batches; this does not affect functionality Color: As shown Material: PCB Package Contents: 1 x DC Powered ESP32 16 Channel Relay Module 2 x Pin Headers Package includes only the items listed above; other accessories are not included Note: Lighting conditions and display settings may cause slight variations in color between the image and the actual product. Measurement tolerance: +/- 1-3 cm