The BGS4 from BeRex, Inc. is a RF Amplifier with Frequency 50 MHz to 4 GHz, Gain 10.3 to 24.7 dB, Noise Figure 2.1 to 2.6 dB, Output Power 18.9 to 20.4 dBm, Output Power 0.08 to 0.11 W. Tags: Surface Mount, Gain Block, Power Amplifier. More details for BGS4 can be seen below.