Wireless version : 4.2
Frequency response : 2.4 2.4835GHz ISM band
Range TF card supported : 128M32GB
Distance : 10/20m
Sensivity : 80dBm
MP3&FM Specification
Music format supported : MP3/WMA
Slot : USB2.0
FM radio range supported : 87.5 108.0MHz
Driver unit : 40mm diameter .
Battery capacity : 250mAh
Specification of headphone
Driver unit : 40
Sensivity : 115dB S.P.L at 1kHz
Impedance : 320HM
MIC unit : 4mm 1.5mm 42dB
Rated power : 40mW
Frequency range : 20HZ 20kHz
Plug type : 3.5mm stereo