I bought it in June,2020 but when I first used, my teeth got paint and blood. I stopped using it. 3 months later, I reused it and luckily, no problem happened. It is powerful, I just charged it once but used for over a month. It is helpful with easy food like fruit, bread, rice, noodle, mince, soup but no ways for meat slice. I can easily bring it to work or travel