... pool" in China, USB 2.0 can be used directly into the computer usb port, for laptops, desktops ... the rule that multi-tech can only be used in desktop computers. Built-in wireless modules can be inserted SIM ... pool" in China, USB 2.0 can be used directly into the computer usb port, for laptops, ... the rule that multi-tech can only be used in desktop computers. Built-in wireless modules can be inserted SIM ...