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DescriptionSet-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.Perfect for outdoor sports: running, skiing, skating, hiking, working out, dog walking, holiday traveling,etc.Bluetooth 4.1 version, avallable for most of devices with Bluetooth function.Available for most of devices with bluetooth function.Specification:Headset version: V4.1.Operation distance: 10m.Color: show as picturesHat depth: 10cm.Cap length: 9.5cm.Cap size: 56-68cm.Cap width: 17.5cm.Note:There might be a bit color distortions due to different computer resolutions.There might be size errors due to different computer resolutions.Package include:1 * wireless earphone baseball cap. Package Including .