3 intensity for comfortable brushing experience: soft mode is recommended to new users for ultrasonic toothbrushes or sensitive teeth and gums. clean mode is ideal for daily oral care. mode helps for caring gums. lasts 90 days with 5 hours charging: built-in 2000mah battery lasts up to 90 days after charging. ipx7 waterproof e-toothbrush body and rechargeable. ultrasonic improves oral health up to 100%: 37,000 vpm high-frequency vibration per minute, it drives fluid deep between your teeth, creating exceptional clean for oral sanitary.