Descriptions:Control lights， TV， motors， fans， cameras， video signals， audio signals， electric doors， locks， windows， curtains， cars， etc.You would set different codes if you use two or more receivers in the same placeThe wireless signal can pass through walls， floors and doorsOne/ several transmitters can control one/ several receiversTransmitting frequency: 433MHzPlease refer to the user manual for detailed operationReceiver:Supply Voltage: 12V DCStatic Current: =< 6mAFrequency: 433MHZSensitivity: >= -105 dBRelay Spec: 4A， 120VAC; 3A， 24VDCOperating Temperature: -40℃ to 80℃Dimension: Approx. 7.4cm(L)， 5.4cm(W)， 2.8cm(H)Transmitter:Power Supply: 1pc 23A-12V battery (not included)Channel: 6CHDimension: Approx. 10.8cm(L)， 5cm(W)， 1.8cm(H)Range: 300mPackage Includes:1 x Receiver1 x Transmitter1 x Instruction of usage