Features:Fashion And Keep Warm With Answer The Phone In Winterset-in Mic, Available For Cell Phone To Transmit The Speaking Phone To Your Audio Devices Directly So That The User Can Hand Free Answering Phone Up Via The Device.set-in Li-ion Chargeable Battery, Charge Via Usb Cable, Long Stand-by Time. High-quality Environmentally Skin-friendly and Comfortable Materials: Made of stretchable, ultra-soft and breathable fleece materials, suitable for all sizes of heads, dont wear them on the head With a sense of restraint, it can protect your head from the cold. The intimate and novel design allows you to easily clean the wireless Bluetooth beanie less beanie. Before cleaning, remember to take out the Bluetooth headset from the pocket of the music. Version: V5.0+edrfrequency 2.4026ghz-2.480ghz Transmission Distance: 32.80ft Transmission Distance Of Mic: 33 Ftli-ion Battery:3.7v/200 Charging Time:2 hours Standby Time:30 Hrscontinuous Working Time: About 5hrs