Headband with Bluetooth Headset built-in Sport headband with music speaker, Material is cotton, Support wireless listen to music and hands-free calls, Compatible with all Bluetooth enabled devices, Chargeable using universal micro-USB cable, Bluetooth Version is 3.0+EDR, Speaker drivers is Ø30mm,16Ω, Output Power is 0.5W×2, Stand-by Time is 60 Hours, Play time is about 2.5 hours.