... (+/-3dB).8.S/N Radio:≥70dB.9.Impedance:tweeter 2Ω Subwoofer 3inch.10.Power :DC 5V/1000mAh11.Line-in:Stereo 3 ... Lithium battery14.With FM function15.2.1 portable speaker with subwoofer. LCD display, Support TF/U disk playing, FM function, recharge ... Support TF/U disk playing ,FM function (Retractable ANT) Portable Hifi Speaker