100% Code cleaning method: Press the unlock button and lock button at the same time (some shells use the up button and down button). After the LED indicator light flashes three times, release one button while keeping the other pressed. Then press the released button three times. The LED indicator will enter fast flashing status, indicating all memory data is cleared. The cleaned remote control will not have the LED light turn on regardless of which button is pressed. Copy method: Hold the original remote in one hand and the copy remote in the other, placing them as close together as possible (ideally side by side with no distance between them). Press the copy button on both remotes simultaneously. When the LED indicator flashes quickly after three initial flashes, the copying process is successful. Repeat the same steps for other buttons. For remotes with lower transmitting power, position the original remote directly behind the copy remote during operation. Avoid operating in noisy environments to prevent interference. If copying fails, clear the code and retry the process. Clear testing code before copying: Press the top two buttons simultaneously until the LED flashes three times quickly. Release one button while continuing to hold the other, then press the released button three times. Release both buttons after the LED begins flashing rapidly. If the LED does not illuminate when any button is pressed, the code has been successfully removed. Studying Code: Press and hold one button on this remote and the corresponding button on the original remote, positioning them close together to receive the signal for 3 seconds. The LED will flash quickly and then stay on. Release the buttons. Test by pressing the copied button; if the LED turns on, the copy was successful. Repeat for remaining buttons. Recovery function: If useful codes are accidentally deleted, press the 3rd and 4th buttons simultaneously until the LED flashes quickly three times, indicating successful recovery. Easy to use 4-channel remote control system allows control of various devices, including cars, home systems, garages, and gates. This is not a complete list. If your remote operates on the 433MHz frequency, it may be compatible with this duplicator (note: rolling code remodes are not supported). Compatible with original remote IC models 2262, 2260, 1527, 2240, and similar ICs. Uses a 27A 12V battery; replace when remote range becomes insufficient. Capable of cloning up to 4 remote signals from different remotes. Designed to work with 433MHz fixed-code key fobs. Common applications include cars, garage doors, gate doors, and alarm systems. 4-Channel RF Wireless Remote Control Duplicator for Cars, Garage Doors, Gate Doors, Alarm Systems, etc.