Feature: Quantity: 1 set Item Type: Electric Toothbrush Type: Acoustic Wave Material: ABS+Silicone Size: 22x2.5cm/8.6x1.0 In Rotating speed: 42,000 /min Suitable: Universal Sonic Ultrasonic Toothbrush: Electric Toothbrush Sonic Tooth Brush : Toothbrush Head Package Content: 1X Electric Toothbrush, 1 X Charging Cable, 4 X Brush head How to use: 1. Put a small amount of toothpaste (less than ordinary toothpaste), put the brush head into the mouth and turn on the switch 2. Don't use force like a manual toothbrush. Gently place the bristles at the junction of the teeth and gums to clean by the high-frequency vibration of the bristles for 30 seconds and then change to the next brushing area 3. Replace a brush head every month. The sonic toothbrush is made of selected bristles, which are uniquely cut and rounded, making it soft and comfortable. However, after using for a period of time, it will become rough and easily stained with Ba-cteria, and the cleaning effect will not be achieved. Experiments have shown that the effect of a new brush head for your oral health is much better than the brush head after one month of use. 4. How to replace the brush head, the bristles are facing the button position, pull up vertically to remove the brush head, press down vertically to install the brush head, do not rotate the brush head 5. Turn on the charging switch at the bottom, counterclockwise to open, and clockwise to tighten. Turn it counterclockwise and snap it along the gap to charge it.