ITEM NAME:2016 New Fashion Bluetooth Hats Warm Soft Hat Wireless Smart Cap Knitted Bl Product Description Description: Features: Knitted material, fashion and keep warm with answer the phone in winter. Set-in MIC, available for cell phone to transmit the speaking phone to your audio devices directly so that the user can hand free answering. Set-in Li-ion chargeable battery, charge via USB Cable, long stand-by time. V3.0+EDR Bluetooth version, available for most of devices with bluetooth function. Specifications: Bluetooth Version: V3.0+EDR Frequency: 2.4026GHz-2.480GHz Transmission distance: 30ft or so Transmission distance of MIC: ≠¤3 ft Li-ion Battery:3.7V/120mA Charging time:2.5 HRS Standby time:60 Hrs Continuous working time:about 5Hrs Size: Fits for head circumference 56-62cm Speakers can be taken off so that you can wash the hat Material:Knitted Color: Blue Size: approx. 230*200*20mm/9.05*7.87*0.78'' Net weight: approx. 89g Please note: It is manual measurement, there may be 2-3mm error. And item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same.hope understanding. Included: 1 x Warm Bluetooth Smart Hat(without retail package) 1 x Charging Cable 1 x User Manual.Knitted material, fashion and keep warm with answer the phone in winter. V3.0+EDR Bluetooth version, available for most of devices with bluetooth function. Bluetooth Version: V3.0+EDR. Speakers can be taken off so that you can wash the hat.