The BIG4 from BeRex, Inc. is a RF Amplifier with Frequency 50 to 600 MHz, Gain 19.5 to 20.9 dB, Noise Figure 2.7 to 3.1 dB, Output Power 20 to 21 dBm, Output Power 0.1 to 0.13 W. Tags: Surface Mount, Power Amplifier. More details for BIG4 can be seen below.