Blue ear&reg; Bluetooth Wireless Music Beanie Knitted Hat With Stereo Speaker And MIC V4.1 Fit For Outdoor Sports Like Walking,Hiking,Skating,Fishing... (H1 Black) 100% Acrylic material, knitted beanie, soft and warm V4.1+Edr bluetooth connected technology, supports all mobile phone with bluetooth function. Can connect with 2 smartphones Detachable and washable Built in Li-Lion rechargable battery, supports 6-8 hours music playback Perfect sound quality and super bass effect, you can enjoy your music while you are walking,hiking, jogging, skating, fishing...Keep you warm in chilly days