1、Control the actuation and release of the 1 channel relay through WiFi (for ModBus TCP protocol), support 1-155 seconds delay, inching, with 1 digital input (optocoupler isolation). 2、The module supports for ModBus TCP 01, 02, 03, 05, 06, 15 and 16 commands, giving you the flexibility to select the status of the relay and input for different commands. 3、Provide WiFi configuration tool to modify module address, WiFi network and other parameters, with configuration tool source code.(implemented by DLL call) 4、Use ESP8266 wireless module (ESP-01), WiFi AP/Station mode, AP mode can set password. 5、1 Channel digital input with optical coupling, with status indicator, relay actuation indicator. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.