The HEM584 from Sainty-Tech Communications Limited is a RF Amplifier with Frequency 1500 to 3000 MHz, Gain 22 to 24 dB, Gain Flatness ±1.0 dB, Noise Figure 5 dB, Output Power 18 to 20 dBm. Tags: Power Amplifier. More details for HEM584 can be seen below.