... teeth 3,energy-saving 4,environmental protection Shenzhen Newstart Rechargeable Sonic Toothbrush Details: Rechargeable Ultrasonic Toothbrush Specifications Oscillation Frequency 32,000 strokes ... ), Specification(1pcs) Sample Time 2-7 Days Certification CE&RoHS Rechargeable Sonic Toothbrush Functions:(1)Stepless speed changing system,20000stroks/min ...