Fangrui Product Details Features: 1. Ultra-small Size Diy Light Switch Module; 41x41x22mm Ultra-small Size Body, Compatible With Of Installation Boxes On The Market. The Small Switch Module Can Be Easily Installed On The Switch Mounting Box Or Light. (note: Please Turn Off The Power During Installation) 2. With Timer, Schedule, And Countdown Functions, You Can Set A Schedule According To Your Personal Needs, And Time And Countdown To Maximize Your Intelligence And Diy Your . 3. State Memory Function, The Switch State During Shutdown And Recovery Can Be Set To On, Off And Remain The Same As Before Shutdown. 4. Group Control, Sharing And Linkage Functions 5. Tuya Smart Wifi Four-way Switch Smart 4-way Switch Mini Cassette Switch Smart Home, Can Be Connected To 4 Light Bulbs Description: 1. Wiring Method: Zero Live Wire 2. Rated Voltage Range: 100-240v 3. System Support: 4. Switch Type: Push Button 5. Switch Mode: One Open And Two Controls 6. Control Method: Single Control Once Opened 7. Tips:can Directly Connect To 2.4g Wif