All adapters had been completely tested: Aging Test, Material Test,Over Voltage Test,Over Temperature Test,Safety Test,High performance low calories consumption Fit model:HC3400 HC3410 HC3420 HC3422 HC3426 HC5410 HC5440 HC5442 HC5446 HC5447 HC5450 HC7452 Colour:black Material:plastic Package Contents: 1 * Hair clipper Only the above kit content, assorted merchandise are usually not included. Note: Light and assorted displays may cause the color of the thing within the picture slightly different from the genuine thing. The length allowed error is +/- 1-3cm.