Features ¡¡V4.0+EDR Bluetooth version、 available for most Bluetooth device like iPhone、 ipad、 Samsung、 Sony、 Blackberry、 HTC etcSupports hands-free call、 music and keeping warm function80% cotton material、 comfortable to wear、 washable and detachableBuilt-in 3.7V 100mA lithium battery、 standby time up to 60 hoursAdjustable cap with earphonesBest choice when doing outdoor sports like walking、 jogging、 cycling、 touring、 fishing、 etcGeneral Specs ¡¡Type Bluetooth baseball cap Cap Material 80% cotton + 20% orlonBluetooth Version V4.0+EDRFrequency 2.402-2.480GHzSensitivity 102dBSpeaker 10mmOperation Range About 10mBattery 3.7V 100mA lithium batteryCharging Time 2 hStandby Time About 60 hPackage DetailsWeight: 112.35 g Size: 24*17*10 cm