Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Looks great...but

I purchased two of these - one for each child. We charged them the recommended time before use. Neither of them worked, so we charged them again, this time overnight. They still did not work. I have to say, though, that they did work when plugged in. My kids really liked them - they come with the cool carrying bag and they are easily handheld. But if they only work while plugged in, they were not very portable and did not fit our needs. I ended up purchasing some Axion units, which are not handheld and actually more like little laptops, but they work well enough.