Main Features:<br />V3.0 + EDR Bluetooth version， available for most of devices with Bluetooth function<br />Protects you from cold winter and will also allow you to listen to music and talk while doing varieties of other activities<br />Built-in microphone， available for cell phone to transmit the speaking phone to your audio devices directly， hands-free answering<br />Built-in Li-ion chargeable battery， its charging depends on USB cable and it comes with long stand-by time<br />Headphone can be taken off so that you can wash the hat<br />It comes with stylish design and even helps you keep warm while listening to music<br />Perfect for traveling， waiting for the bus and jogging in the cold winter<br /><br />    Specifications<br />General<br />	 Size: One Size                                                  <br />                        Type: Bluetooth Music Knitted Hat                                                  <br />                        For: Outdoor                                                  <br />                        Color: Red， Black， Brown                                                  <br />                        Functions: Sun protection， Windproof， Decoration， Stylish， Soft-touch， High quality， Sun Block， Keep Warm                                                	<br />Bluetooth Specification<br />	 Bluetooth Version: V3.0+EDR                                                  <br />                        Bluetooth Name: Bluetooth Hat / Call me                                                  <br />                        Bluetooth Function: Answering Phone， Microphone                                                  <br />                        Frequency: 2.4026GHz - 2.480GHz                                                  <br />                        Frequency Response: 85db                                                  <br />                        Transmission Distance: Less than 10m                                                  <br />                        Transmission Distance of Microphone: Less than 1m                                                  <br />                        Power Supply: 3.7V / 200mA Li-ion battery                                                  <br />                        Charging Time: 2 hours                                                  <br />                        Standby Time: 30 hours or so                                                  <br />                        Working Time: About 5 hours                                                	<br />Basic Information<br />	 Product weight   : 0.110 kg                                                  <br />                        Package weight   : 0.200 kg                                                  <br />                        Product size (L x W x H)   : 22 x 20 x 6 cm / 8.65 x 7.86 x 2.36 inches                                                  <br />                        Package size (L x W x H)  : 28 x 13 x 3.2 cm / 11.00 x 5.11 x 1.26 inches                                                	<br />Package Contents<br />	 Package contents: 1 x Bluetooth Music Hat ( Built-in Li-ion Battery )， 1 x USB Cable                                                	<br /><br /><br /><br />                                            <br /><br /><br />                                                <br />