OVLENG MX555 Bluetooth 4.1 Headphones Wireless Stereo Noise Isolating Headset with Microphone for All Audio Devices - Black 1. A trendy and hip headphone gives you a great music experience without compromising on style 2. Luxurious ear pads that will keep you hooked onto your music all the day, which is perfect for travelers 3. The headset also features a universal microphone which allows you to easily pick up calls even when enjoying your favorite music 4. The headset comes in an attractive colour and is sleekly designed for comfort and the ultimate in crystal quality sound 5. Built-in microphone 7. Universally compatible with all audio devices. 8. It's so light that easy to carry in summer. 9. Distance : 10m 10.Battery Volume : 200mAh 11.Charging voltage : DC5V 12.Loudspeaker size : 40mm 13.Speaker impedance : 32Ohm 14.Working time : music3-5h,call 6-8h 15.Bluetooth version : 4.1 16.Power rating : 100mw 17.Working voltage : DC3.7V 18.Frequency response : 20-20kHz