1. Onboard and stable ESP32-WROOM-32E module, large capacity 4M Byte Flash 2. The I/O port and UART program download port of the ESP32 module are all lead out to facilitate secondary development. 3. Onboard DC-12V to 3.3V power supply circuit, the power supply mode supports DC-12V 4. Onboard reset button and IO0 programmable button 5. ESP32 supports the for IDE Compilation Tool And Provides Reference Programs In The for 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. Model:ESP32 16 Channel Relay Module Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Not Affect The Use. Colour:As Shown Material:PCB Package Contents: 3 x DC Powered ESP32 16 Way Relay Module 6 x Pin Header 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.