For this comparison, a CHIP specialist editor examined test reports from other publications as well as the most popular offers (“best sellers”) and customer opinions from online retailers. Based on this we made the product selection. When selecting the top devices, we focus on models with more than four stars and a reasonably high number of reviews. We have read a selection of customer reviews and selected devices that, based on our professional assessment, meet the needs of the users. The products have not been tested in the CHIP test center.