1，support format:：MP3
2,THD(Total hamonic distortion):＜0.1%
3,SNR(Signal noise ratio):：＞90db
4,frequency response:20HZ-20KHZ
5，bluetooth protocol:V2.0+EDR(down compatible with 1.1)
6,radio frequency:2.4GHZ,GFSK
7，phone frequency response：300HZ-3KHZ
8，battery type: built-in rechange lithium battery
9,full power use of time: play mp3 about 20-25 hours
bluetooth call: about 8-10 hours
10,output power:bluetooth output10mw
MP3 output 20mw(nominal)/40mw(max)
11,microphone: large-diameter ear attached style with soundproof effect