i7 Bluetooth Headset, Mini Earbud Headphones With Mic Features: 100% Brand New mini bluetooth headset Newest Wireless Bluetooth headset earphone, two-channel MP3 Music Handsfree with vibration microphone for all phone and other bluetooth devices. This bluetooth earphone uses the new headset shape design, using the world famous Bluetooth Stereo Bluetooth chips, to ensure high-fidelity sound quality and stable performance and excellent call quality. Specials: - Bluetooth V4.2 - Portable lightweight and sweatproof design - Built-in microphone - Built-in rechargeable Li-ion battery - Multipoint pairing. Support HD music playing - Built-in 14.2mm nedymium driver - Clear bass resonance, CVC wind noise reduction, and superior sound isolation Package: 1 X mini bluetooth Headset 1 X USB charger cable. Bluetooth version: V4.2 Working range: up to 10 meters on open air Frequency: 2.402-2.480GHz Music/phone call: 3-4 hours Stand-by time: 100 hours. Reception level of sensitivity: < -80dbm 8. Rechargeable battery: 60 mah 9. Compatible with apple iphone 6/6s/7, ipad, notebook, samsung android, etc. Common problems: 1. Not pairing: please check if the headset has entered pairing mode. (turn the bluetooth on and keep press the function key until the led light flashing red and blue alternately); 2. Device not found: please check if you have turned on the bluetooth function on your devices, or please kindly try to restart your phone, the name of this earphone would be i7; 3. Not charging: please kindly check if you are charging correctly, if the earphonepletely out of power, it might take longer to be fully charged; 4. Volume control: consider it's so small size, you need to adjust the volume on your smart phone, there is only one key button on the earphone, for power on/off/answer or reject phone calls.