Mini Bluetooth Headphones, Gendax Smallest Wireless Bluetooth 4.0 Earphones Stereo Headset Hands Free Earbuds with Mic For iPhone, iPad, Samsung For Using In the Office ,Driving Or Jogging (black) Built-in DSP audio processing system microphone, Idea for in car calling or working Office use. Perfect for Stealth Listening or watching at work Built-in 50mAh polymer battery. Up to 3.5 hours of continuous talk time, 3 hours of music time. It can connected with two smartphone at the same time, the wireless range up to 10 meters Compatible with most Bluetooth-enabled devices. This will connect automatically with a phone paired previously Notes: Only include one Right 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 1-2 hours 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 very appreciate if you contact us first when you find the earphone is not fit your ears.