Feature:1. Battery Life: The product has a built in lithium ion rechargeable battery, which can be charged via USB; It can provide up to 8 hours of music playing time; Users don't have to worry about the lack of electricity when they go out for sports and travel.2. Product Function: The BT control panel of the product can answer the phone, adjust the volume and listen to music. It is also equipped with a volume manager to easily control the volume.3. Easy to Wash: The headband is detachable, which is convenient for daily washing; The headband made of nylon fabric has the functions of sweat absorbing, anti slip, skin friendly and breathable.4. Convenient to Carry: The scarf is light and portable, and can be placed in a pocket or bag. Users can take it out anytime and anywhere when they need it.5. Applicable Situation: The music headband can be used when exercising, doing housework, or sleeping; It can also be given to family and friends as birthday or holiday gifts.Specification:Item Type: Sports music headbandProduct Material: NylonFlat Length: 40.6cm / 16inHead Circumference: 55.9-71.1cm / 16-28inWeight: 82.00g/2.89ozBT Version: V 5.2 EDRMIC Transmission Distance:<1MTransmission Distance: 20MBattery Type: Lithium batteryBattery Capacity: 150mAH (shipped with built in battery)Charging Time: 2 hoursContinuous Working Time: 8 hours.Package List:1 x Sports Music Headband1 x Charging Line1 x InstructionNote:Shipped with built in battery