Features:Light weight for all day comfortable. Easy use and carrying . Bluetooth 4.1 . high fidelity speaker,excellent call quality. Free call and listen music function. Bluetooth Effective Distance:10 meters Distortion degree: ≤ 1%. Recharging voltage: 5 V. Package Weight (kg): 0.04 KG. Build-in rechargeable li-battery. It has a microphone. you can talk to people using the Bluetooth earphone. please check. thanks Specifications: Color: Black/White Bluetooth version: CSR4.1 Job scope: in 10 meters Standby time: > 180 hours Life time: > 2~3 hours Charging time: 1 hours Frequency response: 20 hz – 20 KHZ Package list: 1 x Bluetooth Earphone 1 x USB Charging Cable
