Description: This WIFI relay based on AI-Thinker ESP-01S WIFI module. It is designed for smart home, Internet of thing and other DIY project.With this smart relay, you will easy to DIY your smart switch to control any device by your phone anywhere.Product parameters: Product size: 37 * 25mmOperating voltage: DC5VCommunication: WIFI (ESP8266 module)Transmission distance: the maximum transmission distance of 400m (open environment, mobile phone equipped with WIFI module)Load: 10A/250VAC 10A/30VDC, the relay pull 100,000 times Usage: 1. Power it by DC 5v;2. Open your phone WLAN then connect the WiFi ESP8266-XXXX, Power word:123456783. Open the ESP8266 Controller.app ( Installed it in your android phone before)4. Set IP Address: 192.168.1.1 than you can control your device via the wifi relay module Package included:5 x ESP-01S Relay Module(ESP-01S Not included)