The AA250-RS from R & K Company Limited is a RF Amplifier with Frequency 2 to 5 GHz, Small Signal Gain 23 to 26 dB, Gain Flatness ±2.0 dB, Noise Figure 6.5 dB, Output Power 21 dBm. Tags: Benchtop / Rackmount. More details for AA250-RS can be seen below.