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You'll need to contact the manufacturer for that information. You can find their contact information here: http://bit.ly/1dXB8is
Sorry, there was a problem. Please try again later.Here's a link to the GameCom 307's Product Information article in our online knowledge base. It should contain the info you're looking for: http://goo.gl/BwZr7I Thank you for contacting us. Plantronics Customer Support 1-855-765-7878
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