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Sustainable - these brush heads last 2x longer than standard replacement heads Cruelty-free & Vegan - against animal testing Staggered Battery Life - USB Rechargeable with up to 365 uses per single charge Hygienic & Waterproof - bacteria-resistant, BPA-free & phthalates-free, 100% waterproof & easy to clean! *Can be used with any ISSA™ or ISSA™ mini toothbrush