Received today, installed on a laptop whose OS is XP 3, plug and play worked perfectly. Checking in the peripheral driver list = no error. Then simply run the recognition of close Bluetooth devices: 1 test with my "old" Nokia C5-03 recognized immediately and there is a choice on the key. Transfer test a photo, no problem. Perfect. 5/5. 2nd test with my new Nokia Lumia 520, where the bluetooth is more capricious (and not only that), it works after several attempts, but the dongle is not involved. For the price 5/5. I had in my possession a bluetooth dongle brand "Top Suxess" consistent XP that worked very well ... as W98SE with his driver on mini-cd ... nothing to do and I had paid more than 300 francs the time .. I recommend it without problem, tomorrow I try under W7.