The BT331 from BeRex, Inc. is a RF Amplifier with Frequency 700 MHz to 2.7 GHz, Gain 10.7 to 19.5 dB, Noise Figure 4.8 to 6.2 dB, Output Power 29.5 to 33.3 dBm, Output Power 0.89 to 2.14 W. Tags: Surface Mount, Power Amplifier. More details for BT331 can be seen below.