The 4487-10 from ARRA Inc. is a RF Variable Attenuator with Frequency 2 to 4 GHz, Attenuation Range 10 dB, Attenuation Accuracy ±0.75 dB, Power 50 W, Insertion Loss 0.5 dB. Tags: Module with Connectors, Rotary, Continuously Variable. More details for 4487-10 can be seen below.