Features:_x000D_ _x000D_ 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). _x000D_ 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. _x000D_ Provide WiFi configuration tool to modify module address, WiFi network and other parameters, with configuration tool source code.(implemented by DLL call) _x000D_ Use ESP8266 wireless module (ESP-01), WiFi AP/Station mode, AP mode can set password. _x000D_ 1 Channel digital input with optical coupling, with status indicator, relay actuation indicator. _x000D_ DC 5-24V wide voltage supply, for ModBus Poll support. _x000D_ _x000D_ Specification:_x000D_ Material: ABS_x000D_ Power Require: DC 5-24V Inner positive external negative_x000D_ Power Supply: 3xAA Battery/USB/Phone Charger/Mobile Power_x000D_ Model: ESP8266_x000D_ Color: As is shown on the photo_x000D_ _x000D_ Package List:_x000D_ 1 x Relay Module With Case_x000D_ _x000D_ Note:_x000D_ 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.1Control 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). 2The 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. 3Provide WiFi configuration tool to modify module address, WiFi network and other parameters, with configuration tool source code.(implemented by DLL call) 4Use ESP8266 wireless module (ESP-01), WiFi AP/Station mode, AP mode can set password. 51 Channel digital input with optical coupling, with status indicator, relay actuation indicator.