Overview Bluetooth Headset Smartphone Ear Protection Earmuffs for HTC Cotton 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. Specification Product Specifications: Bluetooth version: V3.0 + EDR Frequency: 2.4026GHz-2.480GHz Transmission distance: 30 feet or less MICROPHONE transmission distance: ≤ 2m Lithium-ion battery: 3.7V / 120mA Charging time: 2.5 hours Standby time: 60 hours Continuous working time: about 4 hours Package Content 1* Bluetooth Earmuffs