WORRY-FREE CUSTOMER SUPPORT: usmile provides a 30-day money-back guarantee and 1-year warranty for quality-related issues. Please feel free to reach out to usmile customer service for any questions. SMART TIMER AND WATERPROOF TECHNOLOGY: A built-in 30 seconds zone change reminder, a 2-minute smart timer and a 4-minute auto-off setting, help you brush scientifically. The IPX7 waterproof rating allows you to brush your teeth in the shower. 6 HIGH-PERFORMANCE CLEANING OPTIONS: 3 cleaning modes with 2 different brush heads bring you 6 different brushing experiences! Such as daily cleaning, gum care, etc., to meet your different needs. 6 MONTHS USE FOR A SINGLE CHARGE: The advanced charging feature will save you time and energy! The brush can power through 6 months with one 4-hour charge. The USB Type-C charging port also makes it convenient for you to charge whenever, wherever. SONIC WHITENING CLEANING: Up to 38,000 sonic vibrations per minute, the usmile P1 whitening sonic toothbrush can remove up to 70% more plaque than a manual brush.