Note: size 1 is for Electric Toothbrush set. size 2 is only for 2pcs Tootbrush heads.
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<br />1. Inductive charging ,Charging time 12-16 hours 
<br />2. Waterproof  IP*7 
<br />3. Humanized prevent slippery design 
<br />4. Three models: The vibration frequency 32000times/min, 26000-32000times/min 26000times/min