Ultra Mini Wireless Invisible Bluetooth 4.0 In Ear Music Player Portable Earphone Earbud Headset Headphone with Microphone for iPhone, Samsung, LG, iPad, HTC and most Smartphone (Black) Mini wireless invisible bluetooth earphone 4.0 in-ear style music player portable sport earbud headset headphone Built-in HD and sensitivity microphone: Idea for in car calling or working use. Perfect for Stealth listening or watching at work. ect for stealth listening or watching at work Built-in 50 Mah polymer battery. Up to 4 hours of continuous talk time, 3.5 hours of music time. Only need to charging 2 hours. Do not over 2 hours Pairing Instruction: Press and hold the button until the voice states"Ready to pair" or the LED light flashing Red and Blue Notice : The bluetooth is only for one ear . Not a pair.Due to the difference of people's ear, this earphone maybe not fits everyone