Headphone + Speaker Zoook Jazz Duo says both! Jazz Duo makes the statement by transforming to one or the other with a push of one intuitive easy access control button. You can use it as headphone or as a speaker when you are tired of wearing it. Share Music with any other Headphone Music Sharing: Allows you to share music via aux cable to any other headphone, build-in headphone splitter, no need of extra splitter! Share music feature allowing daisy chain for listening together, 2 listeners enjoy same music from the device. TF + Bluetooth Speaker + Bluetooth Headphone + Music Sharing + HandsFree Calling + Aux Support Take your calls since it has integrated high performance microphone inside. Share Music with Friends on their Headphone Immersive Sound Experience: High performance 50mm premium driver with natural and balanced audio spectrum to deliver the dynamic music listening and hands free talking experience. Space-saving foldable headband travel companion: Allows simple transportation with its foldable headband design. Collapsible Headphone Collapsible headphones design, easy to carry and save spaces, provides extra flexibility, portability and durability. Connecitivity Options (TF+Bluetooth+Aux) Works with everything: Supports bluetooth/Aux input/micro SD card/handsfree calls/music sharing. 10Hrs Battery backup Minimum 8 hrs. of backup depends upon the sound output, it delivers up to 10 hrs. No Clutter - Go Wireless Lightweight and Lasting Comfort: Large angle of rotation makes sure better fit. Soft leatherette foam ear pillows and literally weightless 135g ensures supreme comfort.