EFOSHM bluetooth headphone,bluetooth headset,bluetooth earbuds,bluetooth earphone,wireless headphone with mic EFOSHM is USA Registered Brand. Built-in rechargeable Lithium-poly battery. Perfectly transfer HD music. Super sound performance. Wherever you go,you could take it to enjoy bluetooth music. Comes with the recently updated Bluetooth 4.1 with enhancements in coexistence, better high quality connections.