?Satisfaction & Guarantee?If you have any questions, please feel free to contact us. We will do our best to solve your problem and make you satisfied. Box contents: Yunchi sonic electric toothbrushes with 1 x electric toothbrush handle, 8 x toothbrush replacement heads, 1 x USB charging cable, 1 x user manual (English language not guaranteed). ?4 hours fast charging takes 30 days? - What is good for travel is that our battery has a large capacity that can be used for 30 days after 4 hours charging (2 minutes / 2 times a day). USB charging: no adapter required, ideal for travel and business trips. It brings more convenient teeth cleaning for your journey. 5 optional modes: Yunchi sonic electric toothbrush with 5 personalised cleaning modes (white / clean / sensitive / polish / massage) for different gum sensitivities and different uses. All 5 in 1, easier to use and save money. IPX 7 waterproof: YUNCHI sonic toothbrush on the bottom of the toothbrush there is a waterproof film that is very easy to clean. Can be used in the bath or shower. 3D DuPont nylon brush heads: for gentle cleaning of tartar and deposits. 8 toothbrush heads are enough to be replaced for almost 2 years, according to the dentist recommendation, replace the toothbrush head every 3 months, saving you money when replacing the brush heads. Smart timer: Yunchi sonic electric toothbrushes with 2 minutes full time and every 30 seconds change the area to develop a good cleaning habit, as recommended by the dentist. 40,000 vibrations per minute powerful electric toothbrush for adults: YUNCHI Y2 Sonic electric toothbrush developed with sound technology, the new generation, high frequency performance through vibration and soft DuPont nylon bristles help you reduce the accumulation of plaque, smoke stains, tea and coffee stains, etc. Superior cleaning effect: continue to use for 2 weeks, you can obviously have healthier and cleaner teeth.