Instruct: Classify a given review into positive or negative sentiment.
Query: Daughter enjoys it, but some things aren't perfect

I purchased this for my 9 year old daughter who is very interested in nature, exploring, and adventure. While she really enjoys using it, one issue we've found is that the sensitivity setting isn't linear, that is, it's difficult to tune it in such a way that it either picks up every bottle cap and pop top, or it won't find an iron spike sitting on the ground. As a first metal detector for a child though, it's entertaining, and allows for fun games. I'd toss some quarters into the yard or out in the woods and let her go try to find them, or bury a small metal box filled with coins or small toys and let her go on a treasure hunt. Overall, I'd recommend it for children 5-12.