This system uses radio signals. The advantage is that you do not have to aim at the Drapes. Simply press a button to switch the device On and Off. You can control up to four (4) devices individually, or 4 groups of devices. There is no programming needed. It's easy to rotate the Receiver's ‘button number' dial to match the desired ‘button’ on your remote control (1, 2, 3, or 4). For group control, set all Receivers to the same button number. When you have remote control applications in different rooms, you can set the 'room number' dial to prevent unintentional control of devices in nearby rooms.