So, first I took it for myself, then I took my mother-in-law, as for knocking out food, the device is good. I did not charge the battery often, more than enough. But time passed, my (irrigator) probably worked more than well, more than 3 years, gradually the water pressure became worse, I think the battery just began to die. My mother-in-law was even more effective than mine (in terms of jet pressure), but he also died, having worked for less than 3 years. I rated it at 3 because of the battery,See full review