What does this do? There is no description. Can I access both M.2 SATA devices without flipping a switch?

This product is an adapter card that allows you to connect dual B+M Key M.2 NGFF SSDs to a 2.5 SATA interface.

Questions & Answers: FOR Metal Case Dual B+M Key M.2 NGFF SSD To 2.5 SATA 6Gb Adapter Card With Enclosure Socket M2 NGFF to SATA Adapter M.2 SATA Adapter

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FOR Metal Case Dual B+M Key M.2 NGFF SSD To 2.5 SATA 6Gb Adapter Card With Enclosure Socket M2 NGFF to SATA Adapter M.2 SATA Adapter

FOR Metal Case Dual B+M Key M.2 NGFF SSD To 2.5 SATA 6Gb Adapter Card With Enclosure Socket M2 NGFF to SATA Adapter M.2 SATA Adapter