Features 1、This smart relay module is based on ESP-01S WIFI module design and can be used for DIY own smart switch 2、Can be controlled remotely through mobile APP, providing APP and LUA source program 3、Easy to use, very convenient and great workmanship, with good performance 4、Suitable for smart home, Internet of Things and other DIY projects. 5、Strict quality control and quality assurance, high safety factor, can be used with peace of mind Specification Item Type: Relay Module Product Parameters: Product Size: Approx. 37 x 25mm / 1.5 x 1in Working Voltage: DC5V Communication Method: WIFI (ESP8266 module) Transmission Distance: The maximum transmission distance is 400meter (open environment, mobile phone is equipped with WIFI module) Load: 10A/250VAC 10A/30VDC, the relay is pulled up 100,000 times Package List 1 x Relay Module