Bluetooth winter hat with headset and hands-free

Bluetooth winter hat with headphones and built-in hands-free. With volume variation and passage of songs, built-in microphone and MicroUSB charging input. Play / pause function and answer / reject calls. With LED indicator lights Includes micro USB to USB charging cable Bluetooth 3.0 Distance Transmission Class 2 Battery 250 mAh Frequency Range 20hz To 20khz Sensitivity: 95DB Impedance: 32? Charging Time: Approximately 2 Hours Talk Time: Approximately 3-5 Hours Music Playback Time: 4-6 Hours (At 50% D Polyester Metal Alloy)