I bought the previous system 3 years ago. Cleaning effect, pressure sensor All right, very satisfied. Initially, the battery monitoring has shown up on a strip of three and only switched off when Red: all right. Then there was no red bar mar but the toothbrush has been turned off at some point in a bar, just brushing teeth ... very nice. Well the same thing happens with two bars, without notice, to weaknesses in the speed. Conclusion: Monitoring is crap, oth I behaved always waiting for the red Ballken came before I have downloaded.