The AAT-21-479/3S from Pulsar Microwave is a RF Variable Attenuator with Frequency 2.0 to 4.0 GHz, Attenuation Range 64 dB, Power 0.5 W, P1dB 27 dBm, Insertion Loss 4.5 dB. Tags: Module with Connectors, Voltage Controlled. More details for AAT-21-479/3S can be seen below.