Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Life Saver

I've been looking for a product like this for years and have been told it doesn't exist - I guess I was just looking in the wrong place! This little iGo is a life saver for anyone who has to travel with an iPod or other gadget. I will say that the batteries don't last long - I tend to only get a couple or few charges out of one set - but it is worth it. There's nothing worse than being stranded with a dead iPod. Even more, having a dead cell phone can potentially be dangerous, so this little credit card-sized charger is great. Plus, with the interchangeable heads, it works with almost any device. Great Product!