Invisible Headphones,Wireless Mini Bluetooth Earphone, Stereo Headset Earbuds (Black) Super Mini Compact Portable Appearance Design ; Elegant appearance,lightweight and stylish ;With LED indicator light ; Built-in DSP audio processing system, can eliminate the noise ; Equipped with a Second Wired Ear Bud which can be insert into the main Ear bud, then transform from Mono to Dual channel, you could listen to music in your both ears if you like; Easy control between voice calls and music . Bluetooth 4.0 Version, CSR High-End chip, High stability, Compatible with most Bluetooth-enabled devices . Barrier-free Effective distance is about 10 meters( Depend on environment, mobile phone and headset line distance). Support Voice Reminding -- clearly know the status about the headphone. It will report the phone number when a call is coming ; Voice Control --By saying Yes or No to answer or reject the phone call . About 1.5 hour Charging time ; About 4 hours Talking Time /3 hours Playing Time/3-5days Stand-by Time ( when full charged )