This 1pc FC Adjustable Attenuator is designed for optical fiber attenuation. It is compatible with FM FCA, SC LC ST female-male SMA, FC-SC, FC-ST, SC-ST connectors. The attenuator provides 0-30dB attenuation, allowing for precise signal control. Made materials, it ensures durability and long-lasting use. Easy to install and adjust, this attenuator is perfect for a wide range of applications.