OtiumDirect via Amazon has their bluetooth 4.1 audio receiver on sale for $9.59 after coupon with free shipping for prime members.
Coupon Code: VF2WSSER?
https://www.amazon.com/dp/B01NCSFAAO
You can use this to add bluetooth to your existing aux port — or convert your wired headphones to wireless. Has a built in battery and charges via microUSB. Also has a mic for speakerphone use.
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