This battery is compatible with various Genius Pro Smart toothbrushes, including the Genius Pro Smart 4, 5, 6, X, 10000, 9000, 8000, 7000, Smart 6000, and other Smart or Pro variants. To ensure compatibility, check for type numbers 3765, 3766, 3767, 3771, or 3772 located on the underside of your toothbrush handle.
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