Use the Oral-B App to seamlessly pair your Smart Limited brush with a smartphone and you're on your way to brushing like your dentist recommends. The Oral-B Smart Limited comes with Position Detection technology which uses Bluetooth technology, your smartphone, and facial recognition technology to provide you with real-time feedback about your brushing habits. The 360 Smart Ring with LED lights allows you to personalize your brushing experience with your choice of 12 colors.