The BG18A from BeRex, Inc. is a RF Amplifier with Frequency 5 MHz to 4 GHz, Gain 14.3 to 15.9 dB, Noise Figure 4.2 to 4.4 dB, Output Power 17.8 to 19.1 dBm, Output Power 0.06 to 0.08 W. Tags: Surface Mount, Gain Block, Power Amplifier. More details for BG18A can be seen below.