Quality is good and battery is enough for whole day. Obviously this does not work on boots but high hills and regular shoes it works perfect. Like anything, you need to use this consistently to see results and so far I am happy with the results I have witnessed. But very poor quality electrode pads I researched on here for a few days, like I do with almost anything I purchase, and the reviews for these hooks is what sold me. Sometimes USB 3. Gracias por leerme. Ive had to explain all this to my wife and, trust me, it can be a hard sell. I felt the quality of the product would be good, as Ive had HyperX in the past, but this was renewed, and both items I received were defective, with the same issue. And it looks idiotic with the middle shelf barren.