The brush is working properly and the battery lasts a surprisingly long time. Without recharge in between he managed almost 4 weeks brushing twice a day. Respect. The motif is super to my son. A coward is the whole, however, but: Where the hell there is change brush heads? I can still see neither Amazon in the drugstore. We must urgently change times, if I do not soon find that, then I will buy another product :-(