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Operating Voltage: 5V DCMaterial: Metal+PlasticTransmission distance: 400mLoad: 10A/250VAC 10A/30VDCSize: 37 x 25 mm/1.5 x 1.0 inchCommunication: WifiESP8266 ESP-01 5V WiFi Relay Module is designed based on ESP-01 / 01S WIFI module and can be used for DIY own intelligent switch. It can provide APP and LUA source programs via mobile APP remote control. Features:- ESP8266 wifi module onboard; in AP mode, it can connect to 5 clients simultaneously. Operating Method: Using an APP, a cellphone connected to a wifi module on the same router may operate the relay. Diode effusion protection. Short response time Package Includes:- 1 X ESP8266 ESP01S WiFi 5V 1 Channel Relay Module Remote Control Switch