[Left Ear Version] Bluetooth Invisible Earphone, Prosensor&reg; Wireless Smallest Headset Earbud Headphone with Mic Support Hands-free Calling For iPhone Samsung and Most Smartphone - [Black] This left ear version mini Wireless headset is designed from Taiwan and the Bluetooth master control chip. Can talk by using cellphone, listening to music. Built-in DSP audio processing system, can be a very good eliminate Noise and echo, to ensure clear communication, and music. Built-in 50mAh polymer battery. Up to 3.5 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: 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. KINDLY NOTE: The size of this Wireless 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.