Detailed Description: 1.Frame materrial: high quality stainless steel 2.Fequency:25000HZ 3.Weight:200-220g 4.Package:1 set per box,also according to the customer 5.OEM is avliable 6.Start voltage:AC4-10V 7.Excellent working condition,never be hot after long-time working 8.The appearance is gold,work powerful at low voltage