Review (4/5): Works as expected like the rechargeable ones
Purchased them for my kids as a cheaper alternative to the sonic are kids rechargeable one. My 10 and 4 yr old boys love them but 5 yr old daughter won't use it. With fresh batteries they're very strong but if you use older batteries that have been used a little, the vibration may be better handled on the littles. I'm worried the vibration could chip their tooth but no actual problems yet. Also register on sonic are website and they will extend the warranty. I think I got a 2 year warranty on these! These will be great for when we travel. My husband and I will be able to keep our expensive rechargeable ones at home. Docked one star bc they do seem a but over powerful and as I switched batteries between the 3 I purchased the strength changed! Kinda strange as they were all the same new batteries