Warm Soft Beanie Hat Headphone With Mic Wireless Bluetooth Smart Cap Feature: V3.0+EDR Bluetooth version, available for most of devices with Bluetooth function. Knitted material, fashion and keep warm with answer the phone in winter. The hat can be washed. Set-in MIC, available for cell phone to transmit the speaking phone to your audio device 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. Support power display on iPhone. Color: Light Blue Specification: Bluetooth: V3.0+EDR-V4.1+ EDR. Frequency : 2.402GHZ-2.480GHZ. Transmission distance : 10M or so. Transmission distance of MIC : < 1M. Li-ion Battery: 3.7V/100MA. Charging time: 2 HRS. Stand-by time: 60 hrs or so. Continuous working time : about 3.5hrs.