Review on GIKERSY USB 3.0 SD Card Reader: Dual Slot Memory Card Reader for Windows Mac OS - Supports SD, SDHC, SDXC, Micro SD, Micro SDHC, Micro SDXC, T-Flash Cards - 2 Pack by Marcus Krieger

Tested ready to use. It stuttered initially when it started copying/pasting to a very fast and capable 1TB NVME drive. Then it took off and gave good transfer speeds - 223 MB/s - First photo Then it stuttered again. Then he took off again and gave good speeds. Then it wasn't installed. Tried three different ports and three different brand cards, nothing, won. Don't stay installed. Tried my laptop. It installed but was only half the speed [Photo 2] of a 5 year old Transcend reader [Photo 3]. He must return.