1. Aluminum crust surface with good performance in heat radiation, suitable for cooling plate installation, can be used in the atrocious environment . 2.Small size, high power load. 3.High insulating capacity, encapsulation by non-flame inorganic material, good performance in vibration. 4.Multi connection form will be easily to fix . 5.Widely used in Power supply, Transducer, Elevator, Arena audio and high requirement equipment Industry. 6.Resistance tolerance：±1%,±2%,±5%,±10%.