OnlyCellphonemasters offers the Plantronics M40S Stereo Mobile Headset at unsurpassed quality and price. The Plantronics M40S Stereo Mobile Headset has a sleek design that is both durable and portable. With the barley noticeable inline microphone enjoy clear conversation and music with littler interference. While on the phone, drive safer with both hands on the wheel. Easily place the ear buds with one hand and enjoy the convenience of only one ear bud for both your calls and music. Plantronics M40S Stereo Mobile Headset compatibility with most of today’s cell phone, MP3 players and laptops can save you money. With a discreet, popular in-ear and low profile fit this Plantronics M40S Stereo Mobile Headset can be taken anywhere.