The BG12B from BeRex, Inc. is a RF Amplifier with Frequency 50 MHz to 4 GHz, Gain 14 to 18.5 dB, Noise Figure 2.8 to 3.2 dB, Output Power 17.9 to 20.6 dBm, Output Power 0.06 to 0.11 W. Tags: Surface Mount, Gain Block, Power Amplifier. More details for BG12B can be seen below.