The 4951-100 from ARRA Inc. is a RF Variable Attenuator with Frequency 2 to 4 GHz, Attenuation Range 100 dB, Attenuation Accuracy ±1.5 dB, Power 200 W, Insertion Loss 1.5 to 6 dB. Tags: Module with Connectors, Rotary, Continuously Variable. More details for 4951-100 can be seen below.