The AA400-RS from R & K Company Limited is a RF Amplifier with Frequency 500 MHz to 4 GHz, Small Signal Gain 27 to 29 dB, Gain Flatness ±2.0 dB, Noise Figure 11 dB, Output Power 32 dBm. Tags: Benchtop / Rackmount. More details for AA400-RS can be seen below.