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A USB-based device that transmits and receives Bluetooth wireless signals. It plugs into the USB port to support Bluetooth mice, keyboards and other Bluetooth devices. Also called a "Bluetooth dongle.

Modern wireless optical mice are cool and all, but my vintage IBM trackball mouse from last century is even nicer.

I work in an office where people bring in their laptops and pair them with various Bluetooth devices in the office. The problem is that Bluetooth doesn't deal very well with this particular use case.