Feature: 1. PBT soft brush protect the gums. The brush head is small and can be cleaned deeply, which is convenient for cleaning the back teeth. 2. The rotation frequency is about 6000 times/minute, and the silent sound waves, used for gentle cleaning. 3. Low‑frequency vibration can easily brush away the tartar, reduce the pressure on the gums, and will not damage the baby's gums. 4. The whole body waterproof design, integrated molding process, can be washed, easy to clean and maintain. 5. Brushing order is to brush the outside first, then the occlusal surface, and finally the inside; first left and then right, up and down, outside and down, and outside and inside. Specification: Item Type: Toothbrush Material: PP+PBT Brush Product Power: 1W Rotation Frequency: 6000 Times/Min Power Supply Mode: 1 x AA Battery (Battery Not Included) Weight: Approx. 84g / 3oz Product Size: Approx. 178x25mm / 7.0x1.0in How to Use: Unscrew the cover with screws, install an AA battery (not included), and press the button on the bottom to use it. Package List: 1 x Toothbrush (Battery Not Included) 2 x Brush Head Note: 1. Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.