Product features: 1, featured international FDA certified silicone, soft and comfortable, gentle protection sensitive fragile gums 4, 2 speed regulation, 183 under / second high intensity sound wave pulse + silica gel 3, intelligent warm reminder, 2 minutes and 30 seconds for rigorous cleaning time, area to remind, avoid the same area over clean 4, IPX7 * waterproof, one form, effective protection of lithium battery, worry free 5, super battery life, a charge can be used up to 365 times.