Features: Perfect for long walks, these had the earbuds built in and the control buttons on the side. Set-in MIC is available for cell phone to transmit the voice to your audio device in the hat directly. Pair theBT, then you can answer the phone calls through the hat. BT is easy to hook up. Compatible for all smart phone and BT devices. Built in rechargeable Li-Ion battery. Perfect for outdoor sports: fishing, camping, picnic, hiking, working out, dog walking, holiday traveling,etc. The hat can be Washed. (Speakers can be taken off so that you can wash the BT Music hat). After wash it, you can put them back into it again. A wonderful gift for your family or friends in summer.