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Based on ESP-01S WIFI module. Wide voltage input, support DC 5V. Light weight, compact size and very easy to install in a small case. It can be used

SING F LTD 1pcs ESP8266 WiFi Relay Module with ESP-01S Relay Adapter Module for Smart Home Appliance Connect Fan Illuminator Smart Switch Phone APP

Modulo Relay Rele Wifi Esp8266 Esp-01s 5v Automatizacion Hob