Do not want to take my smartphone into the bathroom morning and evening and this little device gives me all the information that I need.
My old display (3741) worked perfectly well with a previous generation Oral-B toothbrush. However the old display did not work with a 9000 purchased 2 years ago. I always regretted not having a working display and have now rectified the situation with this new (3742) model. I am very pleased with this purchase and the excellent service provided with delivery the next day.
I bought this to go with an Oral B with which you needed to have the app and take your phone into the bathroom. It works perfectly.