Credit: Brando
Bluetooth connectivity, built in battery, charging via microUSB. And as you can see from the photograph, the hat holds the speakers over your ears.
Not so obvious from the photograph: a microphone is included, so you can use it for phone calls as well.
http://the-gadgeteer.com/2014/12/26/bluetooth-speaker-hat-keeps-your-head-warm-and-your-ears-filled-with-music/
http://shop.brando.com/Bluetooth-Speaker-Hat_p12451c0201d033.html
Good for cold weather, but you’ll want a different headset arrangement come summer. / 100% Acrylic Hat access phone function making a call noise reduction system high quality speaker microphone keep head warm colors black Bluetooth V3.0+EDR frequency 2.402 GHz transmission Distance: 10M battery 120mA LiIon lithium ion battery bluetooth speaker hat microUSB charging cable Bluetooth speaker hat Brando tech clothing item acrylic hat keep your head warm cold outside Bluetooth speaker phone capability charges via micro USB microphone three button touch interface control controls volume music playback /
