Feature: 1. Built-in mature and stable ESP32 WROOM 32E module, large 4M byte flash; 2. The I/O ports and UART program download ports of the ESP32 module are all executed, which is convenient for secondary development; 3. Power supply voltage DC 7-60V; 4. Onboard ESP32 module IO0 programmable button and reset button; 5. ESP32 supports the use of ArduinoIDE development tools; 6. Built-in 2-way 5V relay, output switch signal, suitable for controlling and controlling the load whose working voltage is within AC 250V / DC 30V; 7. 1 Programmable LED and relay display onboard.Package Included:1 x Relay Module,Weight (kg):0.041