I have one computer I use this on. I know you would not regret purchasing these but I have to say that at first they are tight. I got these and they did not fit my Hyper-X Cloud II headphones as advertised, would not recommend as a purchase. I broke my foot and my foot surgeon said I had a choice of shoes to wear at this point in my recovery - Birkenstocks or Birkenstocks. If you wanted to be understood when you talk this book is a MOST The tool comes with 3 adapters to use in your ear and make sure youre not scratching it and 3 scoops. Price wise they are perfect for what they are, and if they broke its cheaper then replacing a $20+ pair with kids options slim in my rural area. ***UPDATE*** though they really should include instructions, I was able to get it put together. These are Authentic. I bought recently one but it has Bluetooth connection problem.