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. Built-in 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 relays 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 but will not affect functionality Color: As shown Material: PCB Package Contents: 1 x DC Powered ESP32 16 Channel Relay Module 2 x Pin Header Package includes only the items listed above; other accessories are not included Note: Lighting effects and monitor differences may cause slight color variations between the image and the actual product. Measurement tolerance: +/- 1-3 cm