Rechargeable Sonic Electric Toothbrush for Adults with Custom Mode, Antibacterial Brush Heads, Smart Timer 1. 2-Minute Efficient Sterilization Function: Equipped with an independent UV-C lamp bead (germicidal wavelength 270-280nm) that directly irradiates bristles for rapid sterilization (available only with the sterilization model). 2. Stepless Power Adjustment System: Allows customization of brushing intensity across multiple modes, ranging from gentle to robust. Equipped with real-time adaptive technology, it ensures stable power output, providing users with precise control over the brushing experience. 3. 3D Curved Brush Head Design: Ergonomically contours to tooth surfaces, reaching deep into gaps and gumlines to stimulate water flow and flush away residue. 4. Fading Bristle Replacement Reminder: Blue indicator bristles gradually fade with use. Replace the brush head when 13 of the bristles turn white. 5. 5 Smart Brushing Modes: Whitening, Custom, Tongue Cleaning, Gum Care, and Clean modes to meet personalized oral care needs. 6. Smart Timer & Zone Reminder: 2-minute automatic timer with 30-second interval alerts for thorough and even cleaning across all oral zones. 7. Fast Charging and Extended Battery Life: Achieves a full charge within 4 hours, providing up to 60 days of usage (based on two daily sessions in Sensitive Mode, each lasting 2 minutes). Actual battery life may vary depending on usage conditions and battery cycles. 8. IPX7 Full-Body Waterproof: Fully resistant to water immersion and rinsing for worry-free cleaning.