Fangrui Product Details Relay Status Setting,according To Your Living Habits And Needs, You Can Set The Device To Switch On Or Off After An Incoming Call Or Maintain The Original Switch Status So That Your Home Devices Can Operate Normally. Supports Two Switch Types,it Can Automatically Identify Rocker Switches Or Self-reset Switches And Is Perfectly Suitable For Different Home Switches. Switch Status Synchronization,the Load Can Be Controlled According To The Original On/off State Of The External Switch. After Setting The State Synchronization, The On/off Operation Position Is Fixed And Will Not Change Due To The On/off Operation Of The App. Note: This Function Is Only Applicable To Rocker Switches. Shared Control,share Smart Control With Your Family And Build Your Own Smart Home Together. Hign-concerned Chemical:none Communication Method:wi-fi Product Type:smart Switch Module Operation Temp:-10+40case Temp:tc:+80(max.) Operation Range:00m Colour:as Shown Material:plastic Due To Different Batches, There May Be Diff