Sony MEX-BT3900U Bluetooth USB CD/Mp3 Car Stereo (Radio Tuner,Front Aux Input)

As you would expect from a Sony radio of this price, the device the on the whole performs very well.

The bluetooth phone connection works flawlessly, as does the iPod connection.

But there are a few annoying issues...
- USB socket is not lit up (unlike on other radios) so plugging in a USB stick at night is very fiddly.
- The TA/AF option button is stupid and annoying!
- The display animates every time you switch modes, this is also really annoying.
- The default blue illumination is very bright, I've set mine to red.
- The display does not auto dim at night (unlike other radios).

Other points...
- Users report radio reception can be poor but I've turned off the 'Regional' setting and found no problems.
- Users have reported bugs in the software (e.g. muting with TA on) but I've not found any problems at all.

If you can put up with the annoying points listed above, it's an excellent device and I'm pleased with my purchase.

After spending more than 15 days to choose the best affordable bluetooth radio,I found sony BT3900u to be the best in all aspect.I specially bought for PBAP and opp bluetooth profiles.It came with all the required cables and connectors so fitted exactly in my Vauxhall Astra MK4 within 15 min.The sound quality and the options for sound settings is brilliant giving at the most comfort.compared to some of the users problem reported here is my 100% genuine checked report.
1) Illumination too bright at night---there are 2 options choose red or blue secondly there is an option called dimmer which works well to keep brightness at low.
2) PBAP works fine with iphone4 I can see redial list,caller's name
3) preset speed dail (ObjectPushProfile) doesn't work with iphone as iphone's bluetooth doesn't allow transferring contacts.But then technologies are made and broken by humans.I transferred the contact details through my wife's HTC mobile via bluetooth. it works fine now with iphone paired to Bt3900 and can dial directly from preset numbers 1 to 6.
4) There is a inbuilt microphone which works very well,no need for external microphone.
5) some users reported AF/TP doesn't work.I think it doesn't work if you are manaully setting the station in that case you have to set manually RDS stations as well.The best way is to use BTM setting which scans automatically all the stations including AF/TP.Mine works very well.

Additional Info:
1) comes with remote control which don't think is of much use.
2) I didn't found option in settings to shut the front speakers and listen only through rear
speakers as I used to do with my old Kenwood but not a big deal compared to the fabulous sound
quality.
3) SMS indication doesn't work.I don't think its an issue from sony.probably not supported by iphone but again
not a big deal.

By the time I installed and reviewed the item the price has gone down but no regret,its 100% worth buying this product.

If you order this stereo you will also need to order an external microphone for about £8 which should be installed at the same time as the stereo. The inbuilt microphone is not good enough for anything more than occasional phone calls. The external mic plugs into the back of the stereo unit and come with a long lead for routing through to the correct place in your car (near the rear view mirror in my car). Other than that the stereo works well with my iPhone 4 and I am happy with my purchase.Quality Microphone for Sony MEX-BT2700U, MEX-BT3700U, MEX-BT3800U, MEX-BT3900U, MEX-BT4700U, MEX-BT5700U, XAV-70BT Models MEX-BT MP3 CD USB Mic