a)Features:

 1) Portable and foldable style with very smart and slim size.

 2)Built-in 40mm mylar speaker

 3)Portable USB transmitter, convenient connection to loptop and computer

 4)Built-in high quality micphone for natural and clear sound on chat mode.

 

 b)Specification:

 1)Frequency range ：  2.4G-2.48GHz
2)Modulation / demodulator way ：GFSK
3)Transmitting power ：  0  dBm
4) Frequency response ： 20Hz-15KHz
5) Separation  > 70dB
6)Distortion:   1%
7)S/N ratio:  > 70dB
8)Power :   built-in chargeable 150mAH lithium battery
9)Working :   5 hours