The K4S from Communications & Power Industries is a RF Amplifier with Frequency 16.7 to 2.7 GHz, Gain 60 to 70 dB, Small Signal Gain 0.5 dB pk-pk, Output Power Limit 60.8 to 64 dBm, Harmonics -80 dBc. Tags: Benchtop / Rackmount, Power Amplifier. More details for K4S can be seen below.