Previously had a CSR chip dongle with Bluetooth 2.0. The advantage is that it has built-in Windows drivers. After a driver update through Microsoft no longer worked, so ordered two new. This has has the latest CSR chip Bluetooth 4.0. Unfortunately, the software installed on my computers seems to be an error, the Windows7 is no Bluetooth devices more.
As I am currently a malfunction of the dongle can not exclude only 3 stars - ((