High quality MIC record/A-B repeat /MP4 player /Cancel pre-file /Shock proof, static proof, and waterproof /USB flash /LINE-IN record /5-equalizer modes Bite rate：32kbps-256kbps Temperature：-20℃～+70℃； Output frequency rate：20Hz~20KHz Earphone output：5MW+5MW Port：USB2.0 Operating platform：Windows98/2000/xp/me/nt Mac OS 8.6 or higher Battery pressure：3.7V Charge pressure：5.1V More than 9hours continue playing. Charge time：abt 1.5hours（you should charge 4hours in the first time） G.W： 500g L*W*H：120*100*120mm