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I made me a similar one, but i skipped the cord and just installed a 3,5mm audio jack instead. That way i could use a cable with built in handsfree when i used the headphones at work. After a while i got tired of the cable getting stuck in stuff all the time, so i ordered a cheap bluetooth dongle with built in battery and handsfree, now it works great! :)http://www.gearbest.com/car-audio/pp_198640.html
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