Note: Please observe that it is a Xiaomi YOUPIN ecological chain product, and there isn't any Xiaomi brand at the product or packaging to differentiate true and false ultrasound Real ultrasound: 1. It will resonate when it touches a hard object, and it'll mechanically stop when it touches a young gum 2. No noise Fake ultrasound: 1. Pure physical vibratio 2. Loud noiseFeatures:1. Effective cleaning—This ultrasonic dental scaler makes use of high-frequency sound waves (31,000 events in line with minute) to bathe your tooth and freshen your breath, which is an indispensable helper for oral care. 2. Nine-speed mode—LED electronic extensive display screen display,The nine-speed mode is acceptable for various tooth situations and meets the purposes of alternative teams of people. One key can swap modes, clear-cut and fast. 3. Significant effect—effectively get rid of dental plaque, dental calculus, yellow teeth, bad breath, tobacco stains, and upgrade oral problems. 4. Multiple accessories—Two replaceable tooth heads can be utilized for day by day enamel cleaning, and two advantageous medical grade alloy steel replacement heads can be used to take away tartar, tea stains, and smoke stains. 5. USB charging—USB common interface, could be related to mobile power, computers and plenty of diverse electronic merchandise for charging, long-lasting battery life, handy for you to apply anytime, anywhere. 6 with a robust LED light to aid light up every nook in your mouth, making your tooth cleaning extra comfortably and efficiently:Material: ABS+PC Size: 30*30*195mm Weight: 88g Work frequency: 30KHZ-40KHZ Charging time: 2-3h Use time: About 300 minutes (≥20 times/15 minutes) Charging method: USB interface Battery: Lithium battery Battery Capacity: 700mAhQA: Q1: How to show it on? A: Please make sure it has been completely charged, then please One-key start, clear to function and simple to use. Q2: Lamp lights,but there's no vibration? A: The scaler won't vibrate within the air or tender object,it only vibrate on hard object,such as your teeth. Q3: How to alter the mode? A: The scaler will not vibrate in the air or delicate object,it totally vibrate on challenging object,such as your teeth. there may be soft,comfort and powerful mode to change product picture, structure photo and performance diagram in the online page are for reference only, the impact of the physical product could also be barely different, the explicit product shall prevail.