MFJ-4128 Switching Power Supply 13.8 28a It is lightweight (only 4 lbs.) 7" W x 2 " H x 7 " D It features over-voltage and over-current protection systems and has a quiet internal cooling fan with fan on LED. MFJ-4128 features a selectable AC input voltage from 85 to 135 VAC or from 170 - 260 VAC