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I wear mine in my right ear. There is what seems like a button on the bottom ridge but it is a slide the gently slides one way on and one way off. Remember to turn off when not in use to conserve talk time. It will announce in your ear when it is powered on with how much talk time remains and when you power it off. There are 2 push volume buttons on the top ridge.
Sorry, there was a problem. Please try again later.On the side, opposite of volume.
Sorry, there was a problem. Please try again later.The On/Off button is under the bottom of the headset
Sorry, there was a problem. Please try again later.On the bottom
Sorry, there was a problem. Please try again later.On this model it's located on the left side, opposite of the volume buttons. You can see the power switch towards the left of this picture: http://www.plantronics.com/images/catalog/product/large/m90-profile-ea.png
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