Portable concrete vibrator the portable concrete vibrator variety,novel style,good performance,high efficiency,quality guarantee,the reasonable price It is a truly portable one-man operation.It is ideal for bridge decks,culvers and/or any other "hard-to-reach",remote concrete construction site.It is also idesl as an emergency vibrator in case of power failure on the job site. specification: Type:ZPN35 Vibrating Diameter:36mm Frequency:230Hz Volfage:220V Vibrating Amplitude:0.8mm Power:0.65KW Weiht:185KG