Crelander Self-Powered Wireless Light Switch No Battery and No Wiring Required Smart Wall Switch NO WIRING REQUIRED This Wireless Wall light Switch can be Installed Anywhere Without Running Wires. The Receiver is Wired between the Light Fixture and the Power Supply. The Key Panel does not Require any Wired Connection. Wireless Remote Control Enables Easy Operation Anywhere, Anytime. The effective Range Between the Transmitter and the Receiver is Approximately 30 meters Indoors* and Approximately 80 Meters Outdoors. NO BATTERRIES REQUIRED Our Wireless Light Switch Kits Includes a Wireless Key Panel and a RF ReceiverRF (radio frequency). The RF Receiver Connect to Neutral Wire and Live Wire. The Swithch Key Panel Use EnOceans Technology and Powered by Pressing the Switch Panel. No battery Needed at all. WATERPROOF AND ULTRA THINThe Waterproof IPX7 Enables This Device to be Used under Certain Special Conditions. With an Ultra-thin Design, the Transmitter Looks More attractive, and it is Long-distance Feature Penetrates Walls Easily and Effectively. Simple and Convenient Installation for Ddded Pleasure. LONG SERVICE LIFE Designed with Ultra-low Power Consumption, It can Run up to 200,000 Hours and Accompany You for the next 20 years. VERSATILEIt can be used to control any electric switch device. One Switch can Control Multiple Receivers, and One Receiver can be Paired with Multiple Switches. And it has one Year Warranty.