Comfort 2.4G wireless USB headset with Crystal stereo sound 1,Foldable design 2,CE,FCC,RoHs 3,USB transmitter 4,Mini Jack Crystal ... sound 2.4G wireless headset with USB transmitter The GD-240 is 2.4G digital wireless headset/earphone/ headphone with USB interface. Embedded lithium-polymer ... always testing the sample before sending . Comfort 2.4G wireless USB headset with Crystal clear stereo sound