The KNP1300S57A from KeyLink Microwave is a RF Amplifier with Frequency 1.2 to 1.4 GHz, Input Return Loss -10 dB, Harmonics -20 dBc, Spurious -55 dBc, AC Voltage 220 V. Tags: Benchtop / Rackmount, Power Amplifier. More details for KNP1300S57A can be seen below.