Product compliant and received on time. Looks good and actually works on Debian / GNU Linux (and other distro) as indicated on the packaging by the manufacturer. Recognized immediately without doing anything (no software or drivers to install) and above, allows the use of two parallel slots, which is a very good point! The rates depend only on the (the) card (s) SD !! Only small problem, in some cases, given the width, it can block access to other ports. In short, good product, reasonable price, convenient, compatible with any OS. Good buy.