... noise & sound distortion, keeps high sound fidelityRemote controller included for remote access controlLithium Battery capacity :900mAhOutput : RMB 10W (5W + 5W) ... THD = 10%Frequency response : 150Hz - 20KHz versatile connection to CD, DVD, MP3, MP4, mobile phone, notebook computer,ipod, PSP ... HM-801 Portable Multimedia 2.1 Speaker System, with Remote Control, SD/MMC, Give Good Sound Output