Motorola Motorokr S9 BT headset works perfectly with N900. Great for stereo audio, and also good for phone communication. Most amusing, is that I have more trouble with pairing this headset up with my Macbook Pro than I do with my N900. I can only use it with one profile or other (headset or headphones) on the Mac. N900 can switch on the fly and doesn't complain about it with the Moto S9.