Here's the facts...I don't know how they work or if they work...this technology is a mystery(generations gaps)...

     In any case...these, I believe, were shop 'display/demo' items...(recovered all kinds of stock from a closed cell phone shop)...

       Am selling the pair...very cheaply...can't guarantee anything...what you see in the photos is everything you'll receive...

        If willing to chance it...go for it...

         Inquiry is always welcome...shipped USPS First Class...within 24 hours of payment receipt...

           Enjoy!