4 keys 433.92 MHz Universal self-learning radio for gates that have a universal frequency of 433.92 MHz with fixed code. The device stores up to 4 different radio control codes and is easy to program : - For radio control programming it is necessary to arrange the device in front of the remote control to be duplicated at a minimum distance. Simultaneously press the duplicate key on the original remote control and the key to be programmed on the purchased radio control (A or B) and it will start flashing a blue light constantly, after a few seconds release the keys. Repeat the same procedure to program the other keys in the command; To close the stored codes press together the keys C and D wait 15 seconds and after the ble light will flash in this way the codes have been stored permanently. - To clear the existing programming you need to press the A and B keys of the radio control at the same time and wait until it starts flashing a constant blue light and then release the keys. This procedure will clear the previous settings and reset the .