Mini Wireless Bluetooth 4.0 Invisible Earphone Headset Headphone Inear Earbud Support Hands-free Calling-Coffee The Newest bluetooth headset with lightweight and compact portable design. Simple and Stylish. Built in HD and Sensitivity microphone. Idea for in car calling or working Office use. Support A2DP , makes you can enjoy clear and natural sound when calling. Built-in 50mAh polymer battery. Up to 4 hours of continuous talk time, 3 hours of music time. Can connected with two smartphone at the same time, the wireless range up to 10 meters. Pairing Instruction: Press the power button of the headset for about 5 SECONDS or LONGER until you see the Blue & Red Light blinks alternately or Hear a beat, then you could connect it with your cellphone. Attentions: Only include one Right earbud; Only need to charging 2 hours, do not over 2 hours.