Features 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. Specification Features: 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). 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. Provide WiFi configuration tool to modify module address, WiFi network and other parameters, with configuration tool source code.(implemented by DLL call) Use ESP8266 wireless module (ESP-01), WiFi AP/Station mode, AP mode can set password. 1 Channel digital input with optical coupling, with status indicator, relay actuation indicator. Specification: Material: ABS Power Require: DC 5-24V Inner positive external negative Power Supply: 3xAA Battery/USB/Phone Charger/Mobile Power Model: ESP8266 Color: As is shown on the photo Package List: 1 x Relay Module With Case Note: The IP address of the module AP is 192.168.4.1. You can use the configuration tool to modify the parameters to add modules to other networks. You can also directly control the module. The configuration tool can also modify the module's AP password.