Features:<br /><br />* It support the simultaneous connection of two bluetooth devices.<br />* Import CSR4.0 chip， stable and quicker connection; the tranmission distance could up to 20M in open area.<br />* Long battery life， 250h standby time and approximately 5h talking time.<br />* Engonomics design， lightweight and comfortable wearing.<br />* Power display for IOS system. The status of battery would be informed by voice prompt for other phone.<br />* You could just say &amp;quot;YES&amp;quot; to answer or &amp;quot;NO&amp;quot; to reject when there is a incoming phone call.<br />* HD 1080p， smart CVC noise reduction， wired control to shift songs， provides you the enjoyment of music.  <br /><br />How to use:<br />1. Bluetooth connection: Long press the middle button until the red and blue light flash alternatively， then open your Bluetooth devices， and search for &amp;quot;S9I&amp;quot;， click it and complete    connection.2. Language change: When the earphong is on pairing mode ( the red light and blue light flash alternatively)， double press the volume +.Specifications:General Specification  Brand  MB  Model  S9I  Color  Black， White  Wearing Type  In-earTechnical Parameters  Microphone  Yes  Wired Control  Support  Bluetooth Version  4.0  Transmission Distance  10M  Receive Sensitivity  122dB  Frequency Response  20-20kHz  Battery Capacity  80mAh  Charging Time (h)  1h  Taking Time  Approx. 5h  Standby Time (h)  250hPackage  Included:1* MB S9I Bluetooth Earphone<br />1* pair of earmuffs<br /><br />