ESP8266 ESP-12F WIFI Wireless Module 1 Channel Relay Shield OverCurrent Protection Wi-Fi Network Relay Module 10A DC 7-30V.
 
Features:
With ESP8266 Wifi module,4-layers board design.
Input overvoltage protection, input with TVS, when voltage exceeds 33V, automatic protection will operate.
Input overcurrent protection.
220V 10A relay, one normally open, one normally closed.
One way optocoupler isolation input, TVS input protection.
High-current terminals.
One output status indicator, one input status indicator.
More safe with relays PCB pin anti-climb design.
Access control server via TCP CLIENT mode
Via HTTP protocol control
Specifications:
Input voltage :DC 7-30V
 
Resources:
1. ESP8266 Relay Module – Control AC Appliances (Web Server)
2. ESP8266 NodeMCU Relay Module – Control AC Appliances (Web Server)