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It has a backup battery of some sort that will hold the programming while you replace the main batteries. Not sure how long it can hold over a dead battery. Not been a problem for us as I accidentally put very weak batteries in last week and my wife just found it and it revived itself with new batteries. Not an issue anyway, as the programming is stored in the cloud with your PC and the wizard program as intermediary. The cloud can remember many programmings so you can back up, restore and move them at will to various remotes. BTW, this is a super nice device, great software, well thought out design. It sets up most buttons by itself when you give it model numbers of your AF gear. Then you can go back and add or reprogram buttons (physical ones or the virtual ones on the screen) however you want. If that doesn't get it done you can 'teach' it blinker sequences if you still have the old remotes. You can then combine the AV gear native commands plus your blinker codes in any way you choose to create 'macros' and assign them to whatever buttons. My Marantz required 6 or so button clicks to change the rear volume so I programmed that as a macro and ta-da, one click volume.
Sorry, there was a problem. Please try again later.Hello, unfortunately the Harmony 665 does not have a battery level indicator. If the batteries die out, you do not lose all your programming.
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