[ Adopts Sonlc Technology ] - Most of the plaque remover on the market are motor vibration (you can feel the vibration of the handle). YaFex electric teeth cleaner adopts the real sonlc technology, the vibration frequency can reach 40KHZ. Effortless crush stubborn calculus, hard tartar, and coffee or smoke stains. (The handle will not vibrate and also without working sound. Use it on your teeth and you will feel it working.) | [ 100% Safe & Painless ] - The dental calculus remover is activated only when the cleaning head touches teeth or hard objects, and it will stop vibrate automatically when it touches soft gums, 100% safe to your gums, and very easy to use even for first-time users. (We recommend starting with the softest mode). | [ NO Vibration, Easy to Use ] The handle of the calculus remover without any vibration during use and with very low noise. Very comfortable to use. (Some customers even think the machine is defective because it has no vibration and working sound, please try it on your teeth or other hard objects if you have similar doubts). | [ 5 Cleaning Modes ] - The teeth tartar remover has 5 adjustable vibration strength modes, Suitable for different sensitivity of gums and different teeth stain conditions, can efficiently remove stubborn calculus, hard tartar and tooth stains. Ideal for the elderly, kids (Over 12 years old) and even pets. | [ USB Rechargeable & 52 Times Use Battery ] - The calculus remover for teeth has a 1500mAh lithium battery. 4 hours fast charge for about 52 times use (5 minutes/time), Come with USB cable (Adapter Not Included), applicable to a variety of charging equipment such as power bank, phone charger, laptop...