About Working way: Latched: Relay:Press On; Press other button Off.About Learning and clearing Method: Learning:Press learning button until the indicator ON, loosen finger, press any button of the transmitter, indicator flashes three times, meaning learning succeeds. Clearning: Hold press learning button about 8 seconds, indicator from ON to OFF, then press remote, Relay did not Respond, it means clearning code successful.About Receiver:Model No.:WT-021. Working voltage:220V2. Working temperature:-40 Degree +80 Degree3. Receiver sensitivity:more than -114dBm (RXB8 receiver module )4. Working frequency:433mhz5. Output voltage:Output 220V6. Max load current:30A7. Applications:Water Pump, Motor ,LampAbout Transmitter:1. Buttons:2 Buttons2. Working Voltage:DC9V93. Operating frequency:433MHz4. Remote Distance:20-3000M5. Operating Current:13 mAh6. Encode:Fixed code / EV1527 codeColour:WhiteMaterial:PlasticSize:Receiver:55x110x35mmPackage Contents:1 * switch controller1 * remote control (delivered without 1 x 9V battery)Only the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.