The 516 from Narda-ATM is a Fixed Attenuator with Frequency DC to 12.4 GHz, Attenuation 3, 6, 10, 20, 30dB, Power 5 W, Peak Power 250 W, Attenuation Accuracy ± 0.3 dB Max @ 3 Db - 6 dB to ± 1.50 dB Max @ 31 - 60 Db. Tags: Module with Connectors. More details for 516 can be seen below.