Newest Smallest Wireless Invisible Bluetooth Mini Earphone Headphone Earbuds Headset with Mic For for iPhone, Most Bluetooth Smartphones - Black Mini Ultra-small S530 4.0 Stereo Bluetooth Earphone. KINDLY NOTE: The size of this Bluetooth Headset is derived from the test date of our engineers which it will be suitable with most persons' ears. But we are not sure it would be suitable for you completely, and we will be much appreciate if you contact us when you find the earphone is not fit your ears. Pairing Instruction: Holding down 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. Built in HD and Sensitivity microphone. Idea for in car calling or working Office use. Perfect for Stealth Listening or watching at work or in the Office. Built-in 50mAh polymer battery. the wireless range up to 10 meters. Attentions: Only include one Left earbud; Please do not charge the headset for more than 2 hours, and the LED indicator will turn on Red when you charge it, then it will turn off automatically when the headset is fully charged which needs 1 hour or 2 hours.