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 M2MU2 adapter is designed for desktop/Laptop PCs that convert 3G wireless M.2 Card to full/half mini card slot.
You can insert your M.2 card (Socket 2 SSIC-base WWAN) such as GSM, HSPA(3.5G), GPS, LTE cards to this adapter then plug to USB port through USB cable.