A warm must-have accessory, One Size Fits Most ADJUSTABLE AND COMFORTABLE: The beanie hat / cap come in a free size that can be adjusted on men & women head with comfort and coziness guaranteed. WARM EFFECT: keeps your head warm covering up the ears and keeps you cosy under the hat. You can try it and let us know how you feel. The beanie comes with 100% money back guarantee How to use: 1.Please use the USB cable to charge it before you start using the Bluetooth Beanie 2.Please remember taking off the headphones before cleaning up the beanie 3.Select the Bluetooth model and click to connect. Enter the password or code 0000 if needed. 4.Pairing:press the ON/OFF button of the control panel,you will see the BLUE-RED light blinking,it will automatically enter pairing model. 5.More guidance can be consulted in the User Manual How to wash: Before washing, please pull out the bluetooth mold first. Hand wash: cold with mild detergent,do not twist Or wring. Speficications: Bluetooth: V4.0+EDR Frequency:2.402GHz-2.480GHz Transmission distance:10M Transmission distance of MIC:about 1M Li-ion battery: 3.7V/100mA Charging time: 2 hours Stand-by time: 60 hours Continuous talking time: about 3.8 hours Hat Size: One size fits most