Beware of Samsung Bluetooth Headset WEP-200.
Samsung creates some of the best mobile phones, but I am not so sure for their bluetooth headsets.

For example, the specific one is a parade of functional inefficiencies:

• the light is only in blue color and does not change to red when the battery is low.
• when you press the side keys to increase/decrease the volume there is no audible feedback to understand if you are increasing or decreasing the volume and how much. All other bluetooth play a simple sound to let you understand the volume.
• It takes too much time to start it up by holding the key down. In my previous (ericsson) blue tooth, it was starting up quickly enough to be able start a powered-off bluetooth and answer a ringing phone call before the call is diverted to the answering machine
• even to hang up a call, it takes some time from pressing the button to the moment the call is actually dropped
  
• It drops very easily from your ear
• the sound is too low