Featuresr v30edr bluetooth version available for most of devices with bluetooth functionr high material fashion and keep warm with answer the phone in winterr set in mic available for cell phone to transmit the speaking phone to your audio devices directly so that the user can hand free answering phone up on via devicer set in li ion chargeable battery charge via usb cable long stand by timer the hat can be washed speakers can be taken off so that you can wash the hatr support powe