Add Bluetooth 4.0 + LE capability to a Windows desktop or laptop that has an available USB-A port. The TP-Link Omada UB400 is a nano-format USB adapter for connecting Bluetooth peripherals without occupying desk space or creating a protruding external device. Its 0.7 in body can remain connected to a notebook or compact PC during regular use. The adapter supports Bluetooth headsets, keyboards, mice, game controllers, and smartphones. A stated wireless range of up to 65 ft supports nearby-peripheral connections in offices, home workspaces, classrooms, and shared desktop environments. Bluetooth Low Energy support is relevant for compatible low-power input devices and accessories that use the Bluetooth 4.0 standard. UB400 connects through USB-A and is compatible with Windows XP, Windows 7, Windows 8, and Windows 10. Windows 8, Windows 8.1, and Windows 10 support driver-free installation. Its compact dimensions distinguish it from larger USB Bluetooth adapters that extend farther from the host system, making it suited to laptops, small-form-factor desktops, and systems where an adapter should remain installed.