CSR Dongle. If used with Windows 7 or earlier, software will be needed which can be downloaded from downloaded from here. This software is also required if more than one of any of our Bluetooth devices is being used.
NOTE: Most of the CSR 4.0 dongles being sold on Ebay are fake. We have tested them and they have cloned the CSR hardware ID but the CSR software does not work and no Bluetooth tray app appears on the taskbar. We have tested the ones we sell.