[. . . ] With the RF technology, you will no longer need to enter your sweet home in dark. Through the signal sending of the TRA 69 HF, you will be able to turn any desirable lights on before entering your house. [. . . ] During operation, please pull out the antenna inside Transmitter TRA 69 HF for better transmission performance (See Fig. Keep electric cable from nearing to antenna that would cause radio waves interference and affect the reception of signal from Transmitter TRA 69 HF. During operation, make sure the combining receiver at least 2 meters away from other receivers to avoid shortening the remote control distance. Operation and function On the front panel of Transmitter TRA 69 HF, The top mark " " stands for ON (Dim) switch and the bottom mark "O" stands for OFF switch. The switch can be respectively fixed at 5, 7, 9 or 11 and control four different combining Receivers in different locations. When press ON button of Transmitter TRA 69 HF, Transmitter sends out an "ON" signal to the combining receiver which receives the signal and its controlled unit turns on. When press OFF button of Transmitter TRA 69 HF, Transmitter sends out an "OFF" signal to the combining receiver which receives the signal and its controlled unit turns off. Pull out or push in When press ON button, LED turns on and a signal transmits to the combining Receiver, the controlled unit of receiver also turns on. When press OFF button, LED turns on and the controlled unit of receiver receives OFF signal and turns off. When the combining receiver has dimmer feature, by keeping pressing ON pushbutton of TRA 69 HF can cyclically adjust the illumination level of the connected light device of receiver from the rate about 5% - 100%. [. . . ] Please refer to the following chart which is used to illustrate the typical compatible machines. The receiver complies with essential safety and radio frequency requirements in accordance with CE (LVD & EMC) and R & TTE directives. [. . . ]