The BG18B from BeRex, Inc. is a RF Amplifier with Frequency 5 MHz to 4 GHz, Gain 15.1 to 20.7 dB, Noise Figure 3.4 to 4.6 dB, Output Power 15.8 to 19 dBm, Output Power 0.04 to 0.08 W. Tags: Surface Mount, Gain Block, Power Amplifier. More details for BG18B can be seen below.