New Portable Mini Speaker EDIFIER USA Support SD Card USB FM Radio Amplifier output power: RMS 1.2W  2 (THD + N = 10%, f0 = 1KHZ) Amplifier SNR:  80dBA Distortion (%):  0.5% Frequency response: 80Hz ~ 20KHz Audio input interface: AUX, SD card, U disk, FM Adjust form: the key regulator Speaker: 1.5 inches (external diameter 46mm), Magnetically shielded, 6 ohms Input Power: Rechargeable lithium polymer battery 900mAh 3.7V (BL-5C) or external DC 5V Box Size: 235 (W)  67 (H)  40 (D) mm Weight: weight about 0.3kg