The BL081 from BeRex, Inc. is a RF Amplifier with Frequency 5 MHz to 4 GHz, Gain 13.4 to 21 dB, Noise Figure 0.95 to 1.40 dB, Output Power 16.5 to 18.5 dBm, Output Power 0.04 to 0.07 W. Tags: Surface Mount, Low Noise Amplifier. More details for BL081 can be seen below.