The QDAT7-0.5-18-63.5 from Qualink Microwave is a RF Variable Attenuator with Frequency 500 MHz to 18 GHz, Attenuation Range 63.5 dB, Attenuation Step 0.5 dB, Attenuation Accuracy 0.5 dB, Insertion Loss 10.5 dB. Tags: Module with Connectors, Digital. More details for QDAT7-0.5-18-63.5 can be seen below.