Singlemode fiber attenuator allow you to change the intensity of the signal to avoid saturation of the receptors. The design of the attenuator is female-male type, also known as "Buildout" and allows it to be connected directly to the computer. The attenuation value can be 1dB to 20dB in steps of 1dB. Each attenuator includes attenuation test and quality polished. The range is 1240nm to 1600nm.