The APRA-S4000A from Advantech Wireless Technologies is a RF Amplifier with Frequency 2.7 to 3.1 GHz, Peak Power 56 dBm, Harmonics -60 dBc, Spurious -65 dBc, AC Voltage 90 to 264 V. Tags: Benchtop / Rackmount, Power Amplifier. More details for APRA-S4000A can be seen below.