Guide Rail Slot Installation: Standard Guide Rail Installation, No Screws, Snap-on Mounting, Convenient And Easy To Install. Wide Applications: Suitable For High And Low Power Distribution Cabinets, Display Cabinets And Racks, Factory Assembly Lines, Corporate Warehouses, Rental Apartments, Companies, Shopping Malls, Hotels, Family Homes, And So On. App Function (only Kws-302wf Support): Cellphone Remote App Control: Download Smartlife App Or Graffiti Intelligent App Connection, Realize Wifi Network Cloud Remote Intelligent Control. Where There Is Signal, You Can Control The Device Whenever And Wherever You Want, Unlimited Distance. App Timing Function: Countdown Function, You Can Add Multiple Sets Of Time Data In The Mobilephone App To Set The Power On. Device Sharing: Share Management, Multi-person Control, Support A One Cellphone To Control Multiple Switches, At The Same Time You Can Share Multi-person Control. Power Failure Protecting Function (kws-302wf Support): Support Over-voltage, Under-voltage,