Specification Relay Receiver: Input/Output Voltage: 100-250VAC Max. Load: 10A Size: 47mm*46mm*23mm Wireless Switch(Remote) Power Type: Self-powered, No battery needed Work Type: Push Button Size: 86mm*86mm*15mm Features: Remote Control , no wire no extension cables required for the switch, can put it anywhere you need to control the light on off Please note , this item is without WiFi , only RF Self Powered Wireless Switch, No Battery, No Wires Required Long Control Range Indoor 30m , Outdoor 200m No Interference Reliable Wireless type, no intereference to each product , you can use many in the same space Multi switches control the same light How to Install the Receiver Connect the relay receiver between AC Power and light or other device Multi switches control the same light Tiny Size Relay Module Easy to Hide