Features: Brand new and high quality Base on ESP32S3 microcontroller with 32-bit LX7 processor, capable of running at 240MHz Integrated 2.4GHz WiFi and Bluetooth-compatible communication Onboards 40PIN header sutiable for some HAT, for expanding more functions. Onboards USB for firmware downloading and debugging Supports 7-36V wide voltages input, suitable for industrial applications Onboards digital isolation to prevent interferences from external signal Colorful LED and RS485 indicators for monitor the operating status of the moduleRail-mounted ABS, easy installation, safe to use Specifications: Material:Plastic Size:Approx.14.5x9cm/5.71x3.54inch Package Includes: 1 Set WiFi Relays Module note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.