Feature:1. The relay module possesses stable performance to meet the needs of various work scenarios.2. All the program download ports of the WiFi module are led out to facilitate secondary development.3. With excellent production process and exquisite craftsmanship, the module is not easy to solder.4. High quality material can make sure the durability and stability of the product.5. With professional design and reasonable structure, the module is easy to replace and install.Specification:Item Type: Relay ModuleMaterial: PCBWorking Voltage: DC7-12V / DC5V USBPurpose: Suitable For Secondary Development And Learning Of ESP8266Suitable For Scenarios: Smart Home Wireless Control And Other Occasions.Package List:1 xRelay Module3 x Pins2 x SocketsNote:1. DC7‑12V, DC5V USB two power supply methods can choose one2. When using AC power supply, do not directly touch the AC90‑250V to DC5V switching power supply with your hands