Features:<br /><br />1. Bluetooth 4.1 version， it could build faster connection， transmit stable signal in high speed， and provide potent sound field.<br />2. Neckband design， more ergonomic， and the net weight is about 24g， more comfortable for long-time wearing.<br />3. Tested by acoustic structure， fliter the noise which would tire， make the sound more pure for mucis and phone call.<br />4. This earphone could connect with two Bluetooth devices at the same time. Strong compatibility with most of Bluetooth devices.<br />5. Vibration prompt， while there is an incoming phone call， the earphone would vibrate to indicate you.<br />6. Intelligent voice prompt， it would indicate you the real-time state of the earphone， such as low battery， power on/ off and etc.<br />7. Magnetic absorption earphone， the earphone could attached with the neckband by the magnetic force while you do not use it.Specifications:General Specification  Brand  REMAX  Model  RB-S6  Color  Black  Wearing Type  In-ear  Net Weight (g)  About 24gTechnical Parameters  Microphone  Yes  Bluetooth Version  V4.1  Transmission Distance  10m  Rated Power  5mW  Receive Sensitivity  105dB  Impedance  16&amp;amp;Omega;  Frequency<br />  Response  20-20kHz  Battery Capacity  160mAh， 3.7V  Charging Time (h)  2h  Working Time (h)  7h  Standby Time (h)  Approx. 200hPackage  Included: 1* REMAX RB-S6 Neckband Bluetooth Earphone 1* USB cable 1* pair of earmuff 1* Manual<br /><br />