Bluetooth 4.0 USB Adapter Black. Even though Bluetooth technology is a widely used wireless technology on mobile devices and peripheral accessories, many laptops donât have the capability to connect with them. The Kensington Bluetooth® 4.0 USB Adapter is a professional-level solution â and a very small one at that. Simply plug the adapter into a USB port on your PC and youâre ready to connect wirelessly with a Bluetooth keyboard, mouse, smartphone, tablet, printer, headset, presenter and much more. The adapter is up to 6 times smaller than a typical Bluetooth adapter, so you can leave it in your laptopâs USB port without interfering with its portability.