Plantronics M2500 is of the two bluetooth headsets that are currently sold by company that is one of the largest headset manufacturers in the world. The M2500 is the lower end version, which very much resembles Nokia HS-4W. The M3500 is a higher end headset with built-in DSP (digital signal processing) which provides automatic volume control and active voice cancellation which reduces back-ground noise so your voice is transmitted clearly to the other caller, even in noisy environments. The M2500 does not provide any of the above described features, but is an excellent relatively discreet model which weights about 23 grams. Design
About 2/3 of the device are made of hard plastic, while hard rubber is used to connect the battery part to the speaker/mic. There are no moving parts, which makes the device harder to break. The charging port is located on the lower end of the battery compartment. I found that the only visual difference between the Nokia HS-4W and the M2500 is actually the angle of ending surface.
The control of the M2500 is accomplished by two buttons a rocker button (Multi-Function Dial) right next to the status indicating LED and a button (Call Control Button) located on the BOOM microphone. The rocket dial is used the headset on/off, and during to call to MUTE or increase/decrease the volume. The Call Control button picks up if there is incoming call, or if holder for more then 2 seconds, invokes voice dial (if the phone support it). Both buttons have nipple like parts which makes is easy to find them.
The headset could be worn on both your left or right ear you have to only rotate the rubber earpiece to adjust it.