1‑Way WiFi Relay Module,WiFi Wireless Smart Switch Relay Module,12V ESP8266 for Android Mobile Phone APP Wireless Remote Control Switch for Smart Home Access Control How to Use: Wiring Instructions: IN+, IN‑: 12V power input TX RX: UART serial port pin 5V, GND, SWIM, NRST: MCU program download port COM1: Common COM2: Common NO1: Normally open end, the relay is suspended before the pull‑in, and COM1 is short‑connected after the pull‑in NC1: Normally closed terminal, shorted to COM1 before the relay is closed, and suspended after being closed NO2: Normally open end, the relay is suspended before the pull‑in, and short‑circuited with COM2 after pull‑in NC2: Normally closed, the relay is short‑connected with COM2 before it is closed, and it is suspended after it is closed Specification: Item Type: 1‑Way WiFi Relay Module Material: PCB Working Voltage: DC 12V Purpose: Only a simple configuration process can be used to achieve wireless control of 1 relay in the local area network using the mobile phone APP Package List: 1 x 1‑Way WiFi Relay Module