4-ch DI and 4-ch DO IoT Wireless I/O Mod WiFi 2.4GHz IEEE 802.11b/g/n WLAN. Supported protocols: Modbus/TCP, TCP/IP, UDP, DHCP, HTTP, MQTT. Supports file-based cloud storage and local logging with RTC time stamp. Supports RESTful web API in JSON format for IoT integration. Configured by mobile devices directly without installing software or App.