The BW871 from Sainty-Tech Communications Limited is a RF Variable Attenuator with Frequency 2 to 3 GHz, Attenuation Range 0 to 40 dB, Power 0.31 W, Insertion Loss 1.5 dB, Control Voltage 0 to 2 V. Tags: Die, Voltage Controlled. More details for BW871 can be seen below.