A marvel of technology and efficiency !!! A little complicated at first but quickly grip. I liked his playful side and work together. Very comfortable and very pleasant to use, thanks to the softness of her brush handle and soft rubber. Formidable efficiency through technology and connected application that lets you know where brush where stress, if you have enough or not brushed, a modular interface (single or pro). I also enjoyed the entertainment can be found in his brushing teeth, weather forecasts, planning RV, news .... short, it is an investment but serves the entire family since there 5 different brushes and really helpful to have impeccable oral hygiene uen allowing you to avoid charges to the dentist !!!