1. Onboard mature and stable ESP32-WROOM-32E module, large capacity 4M Byte Flash_x000D_ 2. The I/O port and UART program download port of the ESP32 module are all lead out to facilitate secondary development._x000D_ 3. Onboard DC-12V to 3.3V power supply circuit, the power supply mode supports DC-12V_x000D_ 4. Onboard RST reset button and IO0 programmable button_x000D_ 5. ESP32 supports the for Arduino IDE Compilation Tool And Provides Reference Programs In The for Arduino Development Environment. It Has 16 5V Relays On Board And Outputs Switching Signals. It Is Suitable For Controlling Loads With Operating Voltages Within AC250V/DC30V._x000D_ _x000D_ Model:ESP32 16 Channel Relay Module_x000D_ Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use._x000D_ Colour:As Shown_x000D_ Material:PCB_x000D_ _x000D_ Package Contents:_x000D_ 1 * DC Powered ESP32 16 Way Relay Module_x000D_ 2 * Pin Header_x000D_ _x000D_ Only the above package content, other products are not included._x000D_ 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. _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_