BlueBuilt is the own brand of Coolblue. We make BlueBuilt mouses ourself. We do so based on data and the wishes of the customers. This way, you can be sure a BlueBuilt mouse works well. We also find user-friendliness very important. It's very easy to set up a BlueBuilt mouse. That means you can get started right away when you get it. And because we trust the quality of BlueBuilt mouses, you get a 5-year warranty on the mouse you purchase.