Light and Sound MP3 Hat The Light and Sound MP3 Hat can be connected to your iPod, MP3 Player, Mobile Phone or any other sound device that supports a standard 3.5mm jack Has a sound sensitive equaliser panel on the side that lights up to the beat of the music! Our MP3 Hat is made from 100% polyester and lined with a soft fleece. It can be hand-washed in warm water...Just remember to remove the speakers beforehand! The integrated speakers allow you to listen to your music in comfort without the need for pesky earphones The MP3 And iPod Sound Hat measures approx 30 cm x 16 cm x 2cm (Flat) and stretches depending on the size of your head!