Onewell Bluetooth 4.1 Music Hat Headphone EDR Earphone Mic Sports Baseball Cap Listen and talk:Bulit-in Mic and stereo speakers hands free for phone call and answer, also listening to music while taking activities high-effect built in battery:Built-in Li-ion rechargeable battery,charge via USB cable.90 hours standby mode and 5-8 hours working time Fit for every size of heads:Adjustable strapback offers customized size for your wearing Easy dismounting: Washable with removable bluetooth device and dry quickly made by 100% Nylon Taslan material You will get:smart phone bluetooth hat x1pc charge cable x 1pc manual x 1pc