Good, cheap, wireless headphones that will work on an iphone 4?

My boyfriends birthday is in two weeks and I want to buy him some wireless headphones that will work with his iphone or his ipod but I don't want to spend over 25 dollars, I usually shop online.

I have found this Android app that works great on Android phones and converts them to a wireless headphone. It is cheap and the quality is great:
https://play.google.com/...sheadphone

Maybe there's an equivalent app for iPhone.

Sennheiser is the most affordable QUALITY brand.

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