One complete set electric automatic greenhouse window opener include the accessory:smart wifi built in window opener motor, chain, bracket, screws,wireless rain sensor,wireless thermohygrometer,wireless remote control Olideauto smart WIFI TUYA APP control electric window opener Feature: 1.Rebuilt overloading protection system,in case the sudden high electric current make the motor burning. 2.Max travel distance is 11.81inch is suitable for kinds of windows, especially the small skylight and hung.Compatible with Alexa,Google Assistant,You can remotely control window via phone APP Tuya 3.Travel distance is adjustable, opening closing percentage can be set via a group on phone APP,it keeps the same when power on 4.More than thousands of pushing and pulling test,HTHP test, salt spray test,etc. ensure the thirty thousand smoothly push and pull to the opener. Installation Tips: 1. The products must not be installed outside where would get wet in the rain. 2. 24V DC is safer than AC version as the large voltage would harm people. The transformer is built in motor,which converts the 100V-240V AC power to 24V DC power,no need extra transformer.