Remote Control Function: This is a universal garage door remote control with a fixed frequency (433.92 MHz) designed to duplicate common fixed code remote controls and learning functions. Steps to Erase Codes: Simultaneously press and hold the left and right buttons on the top of the remote control. The LED indicator will flash 3 times. Release the left button (do not release the right) and click the left button 3 times. The LED indicator will flash quickly and all memory data will be erased. After erasing, you can copy the code. Small and Portable: The small key ring can be easily hung on the car key for easy carrying. Directly replace the old or damaged originals. The buttons feature sliding covers to prevent the doors from accidentally opening or closing when pressed. Steps to copy the code: Hold the original remote control in one hand and the copied remote control in the other. Place both remote controls side by side on the desk, the closer they are, the better. Press the buttons