"You can listen to your favourite tracks now through your skull cap/hat. Wear this warm and cozy cap and enjoy the music wirelessly by pairing it with your mobile phone.Features:V3.0+EDR Bluetooth version, available for most of devices with Bluetooth functionProtects you from cold winter and will also allow you to listen to music and talk while doing variety of other activitiesBuilt-in microphone, available for cell phone to transmit the speaking phone to your audio devices directly, hands-free answeringYou will look great and keep warm while listening to your favorite music. Keep the sound track to your life playing all the timePerfect for traveling, waiting for the bus, jogging in the cold or just rocking out in your bedroomBluetooth version: V3.0+EDRFrequency: 2.4026GHz-2.480GHzTransmission distance: 10M / 32.80ft Transmission distance of Mic: ≤1M / 3.28ftLi-ion Battery: 3.7V/100mA Charging time: 2 hours Charging voltage: DC 5V"