WIRELESS RECHARGEABLE
<br />STEREO EARBUDS WITH IN-LINE MIC 
<br />Blue tooth working range: 10M
<br />Bluetooth Version:4.2
<br />Battery:  50mA
<br />Package Includes :
<br />1 X Wireless Bluetooth HandFree Sport Stereo Headset headphone  
<br />1 X Micro USB Cable
<br />SPECIFICATION
<br />Battery 3.7v  50mA built in
<br />Rechargeable Li-on battery
<br />Charging voltage DC 5V
<br />Charging time about 1 hour
<br />Charging currency  15mA
<br />Standby currency  2mA
<br />Working temperature -40 to +80
<br />Play time  3hours
<br />Talk time  4hours
<br />Standby time  about 40 hours
<br />Driver unit 10mm
<br />Impedance 16 ohm
<br />Frequency 20-20kHz
<br />Sensitivity 100db +/-3db 
<br />Bluetooth version V4.2
<br />Working distance 10m
<br />
<br />Mic Dimension  4 1.5mm
<br />Sensitivity -49dB 3dB
<br />Directivity Omnidirectional
<br />Impedance 2.2k