Specifications:<br />Model: MST M12<br />Color: Black， White<br />Wearing Type: Neckband<br />Dimensions: 145*175*25mm<br />Microphone: Yes<br />Bluetooth Version: V4.1<br />Transmission Distance: 10m<br />Receive Sensitivity: 116dB<br />Impedance: 16┯<br />Frequency Response: 20-20kHz<br />Battery Capacity: 135mAh， 3.7V<br />Charging Time (h): 2h<br />Taking Time: 6h<br />Working Time (h): 7.5h<br />Standby Time (h): 400h<br /><br />Package Included:<br />1* MST M12 Neckband Sports Wireless Bluetooth Earphone<br />1* USB Charing Cable<br />1* Manual