1.Compact and simple structure,light; 2.Stable performance; 3.Low attenuation error,high return loss; 4.Bellcore standard. DYS FIBER OPTIC's attenuator have adapter type andplug type.Including FC,SC,ST,LC,MU,E2000 etc.Meet theEUROPE ROHS request.Good loss value can adjust opticalpower to desired levels!