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Hi there, Yes you may use this to the Philips Sonicare 4100 Series Sonic electric toothbrush Model number: HX3681/23. Make sure to charge only with Philips WAA1001, WAA2001, UL or equivalent safety approved adapters with input ratings (100 - 240V~; 50/60Hz; 3.5W) and output ratings (5Vdc; 2.5W).
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