The QMC-CRYOATT-20NM from Quantum Microwave is a Fixed Attenuator with Frequency DC to 18 GHz, Attenuation 20 dB, Power 0.1 W, Attenuation Accuracy ±1 dB, Insertion Loss 0.5 dB. Tags: Module with Connectors, Cryogenic Attenuator. More details for QMC-CRYOATT-20NM can be seen below.