Discontinued
The Marantec ML series of remotes such as the ML-1401 1-button and ML-1402 2-button midi transmitters were used primarily with the Marantec Mac-Lift Deluxe 2005 and Mac-Lift Elite 2007 garage door openers. They could have also been used in some of the Marantec M-Line M4500 and M4700 openers. These ML series of remotes were mainly used in Marantec openers prior to 2003. Some may have been used in other years as the 40MHz frequency remotes were discontinued and stocks were depleted.
How do you determine what frequency you have? The easiest way is to look at the information printed on the back of the remote. There were six models of 40MHz frequency remotes: ML-1401, ML-1402, ML-1404, ML-2401, ML-2402 and ML-2404. Your remote should have red buttons and one of the remote model numbers printed on the back of the remote along with 40MHz printed on the remote.
What if you can no longer read the print on the back of the remote? If the information has worn off and you can no longer read it then you'll need to read the frequency printed on the radio receiver. Look for a long gray antenna wire near the top of the operator and follow that wire back to the radio receiver. You'll find the frequency printed on the radio receiver. You can watch a short video explaining it further here.
All of the 40MHz frequency remotes were discontinued and no remote replacements are available. None of the "universal" remotes on the market will work with the 40MHz frequency receiver. If you find that you have a 40MHz frequency remote and receiver on your operator then you'll need to replace the radio receiver along with the remote.
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