Dell BH200 Owner's Manual page 74

Re-pair devices.
Only certain features appear to work with my computer or mobile
phone
Some Bluetooth devices do not support all features, as they only
support certain Bluetooth profiles. For example, a phone may
support the headset profile, but not the hands-free profile. In this
case, features such as Last Number Redial are not supported.
Stereo music works, but control buttons do not
Stereo music is transmitted using the A2DP profile. However,
control buttons use the AVRCP (remote control) profile.
Make sure your other device supports the AVRCP profile, and if it
does, try re-pairing and connecting to the Bluetooth Stereo Audio
service.
For Windows Vista only:
1 Double-click the Bluetooth icon
2 In the window which appears, select Dell BH200 in the
Devices tab and click Properties.
3 Select the Services tab and uncheck the Remote Control
check box, then click OK.
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in the Windows taskbar.