The HEM575B from Sainty-Tech Communications Limited is a RF Amplifier with Frequency 10 to 3000 MHz, Gain 11 to 12 dB, Gain Flatness ±0.5 dB, Noise Figure 2.8 dB, Output Power 19 to 20 dBm. Tags: Power Amplifier. More details for HEM575B can be seen below.