OverviewBluetooth Headset Smartphone Ear Protection Earmuffs for HTCCotton blend material, stylish, warm in the winter to answer the phone.Set the MIC for your phone to talk directly to your audio device so that you can answer your speakerphone from your device.Built-in lithium-ion rechargeable battery, charging through the USB cable, long standby time.SpecificationProduct Specifications:Bluetooth version: V3.0 + EDRFrequency: 2.4026GHz-2.480GHzTransmission distance: 30 feet or lessMICROPHONE transmission distance: ≤ 2mLithium-ion battery: 3.7V / 120mACharging time: 2.5 hoursStandby time: 60 hoursContinuous working time: about 4 hoursPackage Content1* Bluetooth Earmuffs