About This SMART WIFI FUNCTION BUILT IN MOTOR-The automatic electric window opener has smart wifi function built in motor,Window can be controlled via wireless remote control,Phone APP TUYA,Voice control via Alexa and google assistant(Alexa and google assistant are not included) TRAVELLING DISTANCE ADJUSTABLE FROM 11.81inch TO 15.74inch-People can adjust the travelling distance on the motor or adjust it via phone app Tuya OPENING AND CLOSING WINDOW TIME CAN BE SET VIA PHONE APP TUYA-Opening and closing time can be set on the phone APP,the window auto open and close according to the setting opening/closing time DURABLE CHAIN-High quality two-layers stainless steel chain, which makes the chain stronger and more anti-oxidate AC MOTOR,NO NEED EXTRA TRANSFORMER-The input voltage can be AC100-AC240V,no need extra transformer to convert voltage. Overview Material : Aluminum Brand : Olideauto Color : silver grey Exterior Finish : Stainless Steel Product Dimensions : 18.11"L x 1.65"W x 2.16"H