M.2 stands for Next Generation Form Factor which is invented for PCI-SIG by Intel and it is developed for flat and high-efficiency equipment such as Ultrabook™ or Tablet PCs. It is a natural transition from the Mini Card and Half Mini Card to a smaller form factor in both size and volume which supports multiple function add-in cards/modules including: Wi-Fi, Bluetooth, global navigation satellite systems, near field communication, Hybrid digital radio, wireless gigabit alliance (WiGig), wireless wide area network and solid-state storage devices. Also adds functionality to USB 3.0, display Port, SDIO and SSD-PCIe
The P12S-P12F adapter is M.2 Socket 2 PCIe SSD base to M.2 Socket 1 slot adapter.

P12S-P12F is M.2 socket 2 PCIe base SSD to M.2 Socket 1 PCIe x1 WWAN slot Adapter.
You can insert M.2 socket 2 PCIe base SSD (KEY B) to L12S, then insert to M.2 Socket 1 PCIe x1 WWAN slot (KEY A or KEY E).
Can support all dimension of SSD cards: 2230, 2242, 2260, 2280, 22110.
Only can use on dimension type 2230 M.2 slot.
The extender is designed to minimize the signal degradation effects of the extender by proven design techniques.
It’s also a powerful tool for engineers and factory tests.