Instruct: Classify Amazon reviews into positive or negative sentiment
Query: An excellent value

It's a nice product considering it less than 20 bucks. I've had no problems using it and am very pleased at how well it's working. The battery monitoring feature is nice. And it's actually quite small, the picture is kinda deceiving. It does not have a mapper, but there are many free good ones on the internet, so that's not that big of a complaint. All in all, it's well worth it, especially since it's cheap and works quite well.