Features:1) This Hi-Tech beanie allows you enjoying music while protecting from cold. Built-in microphone let you pick up calls directly. Perfect for outdoor sports like walking、 jogging、 running、 skiing、 etc;2) Combined with excellent sound quality stereo speakers;3) The headphones are removable、 convenient for beanie washing;4) One size beanie fit most heads.Specifications:1) Beanie Material: 100% Acrylic;2) Bluetooth: BQB Certificated Bluetooth V4.1 Chip、 with EDR Tech、 10M/33Ft Transmission Range;3) Rated Power: RMS 10mW x 2;4) Speaker Unit: 32Ω/30mm;5) Frequency Response: 20HZ-20KHZ;6) Battery: 3.7V Certificated High Quality 100mAh Rechargeable Li-ion Battery;7) Standby Time: Over 60 Hours;8) Play Time: Over 5 Hours;9) Charge Time: DC 5V Approx 40 Minutes;10) With Overcurrent、 Overcharge & Overheat Circuit Protection Design on PCB.Packing Content: 1 x Bluetooth Beanie Hat1 x USB Cable1 x User Manual