MZHOU NVME SSD M Key to PCI-e x1 Host Controller

MZHOU NVME SSD M Key to PCI-e x1 Host Controller nvme slot types Acer Travelmate P2 TMP214-53, slot type nvme 40 in 30 slot NVMe SSD provide a much faster overall experience than other types slot 7,300 MBs sequential reads and 6,800 MBs writes puts it well

nvme m2 slot motherboard 2 SSDs have different sockets? How did my NVMe fit in to a SATA socket? How does it support a M key type SATA SSDs? Don't they use M + B