AC220V input for the receiver, press the Set button of the receiver, the LED indicator flash, then press the button of the transmitter, the LED indicator off, it means the learning successful. When you press the down stop button, you will hear the sound of the relay. This controller is perfect for tubular motors,This controller without limited switch Terminal, Tubular Motor with limited switch. Input voltage: AC220V Frequency:433 MHZ Material:plastic colour:White Package Contents: 1 x receiver 1 x transmitter (with battery) Only the above package content, other products are not included. Note: Light 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.