This is so much fun!!!! We use it in our pool and the kids all love it. Works great, floats when left alone, easy to see with the bright color. The battery probably lasts 20-30 minutes being used constantly. I wish I had about 2 more batteries so I could always have a fresh one to put in. Several of our kids are teens and weigh as much as a grown adult & this pulls them underwater the same as it pulls my 11 year old. Highly recommend & wish I had known about this product years ago.